Boating Safety & Operations curriculum

Wearables must be readily accessible, so you can put one on in a reasonable time in an emergency; a throwable must be immediately available, within arm's reach. Coast Guard guidance says a jacket sealed in a plastic bag, locked away or buried under gear fails that test. Canoes and kayaks 16 ft or longer are excused only from the throwable, while racing shells and sailboards are excused from carriage entirely.

The split that matters is turning ability: Type I is built to turn most unconscious wearers from face down to a vertical, slightly backward position, Type II only some, and Type III is not required to turn anyone, since it supports a conscious wearer. Federal rules now speak only of wearable and throwable devices, but labels and guides still use the Type codes.

An inflatable counts toward the carriage rule only while it is ready to work: a full cylinder, every status indicator green, and an oral tube that is not blocked or broken. Many are approved only when worn. Newer labels rate devices by performance Level, the minimum buoyancy in newtons: a lower Level suits calm water near shore, a higher one a longer wait for rescue.

The federal rule applies only while the boat is under way, and it lifts when the child is below decks or inside an enclosed cabin. Where a state has set its own child-wear age by statute, that rule replaces the federal one on the state's waters, so the cutoff depends on where you are. A child's device is sized by the user weight printed on its label.

A well-fitted foam jacket is snug and will not ride up past your chin or ears, so try it on in the water. A device stops counting when its hardware is broken or corroded, its straps are torn, or its foam is hardened, waterlogged, oil-soaked or mildewed. Test foam devices for wear and buoyancy at least once a year, and discard ones that are waterlogged, faded or damaged.

The letter on an extinguisher names the kind of fire it fights and the number the amount of agent, but counting is not simple arithmetic: one 20-B can replace two 5-B units, while a 10-B is credited as just one 5-B despite holding more agent. A date-stamped disposable unit is retired 12 years from its manufacture date, and an approved fixed system in the engine space lowers the number you must carry.

Most boat fires and explosions happen during or shortly after fueling. Before you start, fill portable tanks ashore, close hatches, shut off engines and electrical gear, and send passengers off the boat; keep the nozzle against the tank and wipe up spills. Afterward, open the boat to ventilate, run the blower and sniff the bilge, and do not start the engine until every trace of fuel vapor is gone.

A compartment with a permanently installed gasoline engine and a cranking motor must be open to the atmosphere or have an exhaust blower, and the label beside the ignition switch tells you to run it four minutes and check the engine bilge for vapor. The blower intake sits in the lower third of the compartment, above bilge water. These rules define fuel as gasoline, so a diesel-only boat falls outside them.

Carbon monoxide has no color, smell or taste, and its early signs, such as irritated eyes, headache, nausea and dizziness, are easy to mistake for seasickness or drinking. It collects under canvas, behind a slow or idling boat through back drafting, around the swim platform, and from a neighboring boat's exhaust, and it can linger after engines stop. Treat seasickness as possible CO and get the person to fresh air.

The use rule covers boats under 26 ft whose propulsion can develop at least 115 pounds of static thrust, applies once the boat is planing or above displacement speed, and lifts when the main helm is inside an enclosed cabin. If you are thrown from the helm or fall inside the boat, the link stops the engine, which can keep you from being struck by the propeller and leaves the boat drifting nearby so you can get back to it.

The persons line is a weight of people expressed as a head count, while the weight line totals people, motor and gear, so a full crew with heavy gear can exceed the plate with seats still empty. The length-times-width rule of thumb assumes 150-lb people and ignores the hull's volume, so use it only to estimate for a boat that has no plate.

Too many people or too much gear makes a boat unstable, and the effect is worst when the load sits high or to one side. Keeping weight low, spread evenly fore and aft and side to side, with passengers seated and gear secured, keeps the margin the capacity plate assumes. An overloaded boat is one of the conditions that lets a Coast Guard boarding officer end your voyage and send you back to port.

The first danger in cold water is a sudden gasp and rapid breathing that can make you inhale water, and it passes in about a minute. Over the next ten minutes or so your fingers, arms and legs lose the strength for self-rescue, while loss of consciousness from hypothermia can come in as little as an hour. That is why a life jacket already on matters: it keeps your head out of the water while your limbs fail.

If you cannot get out and rescue is not close, pull your knees to your chest and hug your life jacket (the HELP posture) to protect the major areas of heat loss; a group can huddle with arms linked instead, which also makes a bigger target to spot. Once someone is aboard, remove wet clothing and warm the center of the body under dry layers first, and never give alcohol.

The order runs from least to most risk to the rescuer: reach with a hand, oar or pole while holding on; throw something that floats; row closer; and enter the water only if you are trained. Even strong swimmers drown trying to help, which is why going in comes last. Keep the propeller away from anyone in the water, and return to a person overboard going forward, not in reverse, keeping them in view.

Small outboard boats built since the late 1970s are designed to keep supporting you even when swamped or capsized, so climb in or onto the hull and get as much of your body out of the cold water as you can. Air trapped in clothing and waders adds buoyancy, and thrashing to shed it wastes energy. If you are wearing a life jacket, keep it on.

Puffy clouds building taller, dark clouds to the west or southwest, a sudden drop in temperature, rising or shifting wind and heavy static on an AM radio all signal a change. If caught out, slow to just enough power for headway, put everyone in life jackets and seat them low near the centerline, turn on running lights, and take the waves at about 45 degrees off the bow.

Signals count only if they are approved, in date, serviceable and readily accessible, and you may display one only when people aboard need help. On coastal waters a boat 16 ft or longer carries day and night signals, while a smaller boat needs night signals between sunset and sunrise. A radio MAYDAY on channel 16 does a different job, reaching rescuers who cannot see you.

Scope is the ratio of line out to depth; Coast Guard boater guidance counts the depth plus the bow's height above the water, so even shallow water needs a long line, and heavy weather calls for about 10 to 1. Anchoring from the stern can swamp the boat. To set the anchor, back down slowly while paying out line, then snub it so the flukes bite; firm sand holds well, while grass often keeps an anchor from digging in.

Docking rewards control over speed: approach against the wind and current, keep only enough way on to counter them and steer, and watch how far the bow or stern is swinging. Rig lines and fenders before the approach, not during it. Bow and stern lines hold the boat in, while spring lines stop it surging forward or aft. In a lock the same pattern holds: enter slowly, fenders out, and make fast to the mooring points.

Federal rules treat a recreational operator as under the influence at a blood alcohol concentration of 0.08 percent, or at any level where impairment is apparent, and a state's own statutory limit replaces that figure on its waters. Sun, wind, noise, vibration and motion add fatigue that speeds impairment afloat. Refusing a lawful test can be used against you in a federal administrative proceeding, where you are presumed impaired.

After a casualty, the person in charge must give necessary help to anyone endangered by it, as far as that is safe for their own boat and crew, and give their name, address and vessel identification to the other operator, the injured and owners of damaged property. A death or disappearance must be reported at once; other reportable casualties need a written report within 48 hours or 10 days.

A float plan works only if someone ashore will notice you are overdue and act on it, so leave it with a responsible person rather than keeping it aboard. Write down where you are going, when you expect to return, who is aboard and a recent photo of the boat, because rescuers need details that a friend will not remember accurately in an emergency.

A boat with propulsion machinery needs a state certificate of number, carried aboard on paper or in digital form, and its number painted or fixed on both sides of the forward half in block characters at least 3 inches high. The hull identification number is separate: a 12-character code the builder fixes on the transom's starboard side.

Any oil discharge that leaves a film, sheen or discoloration on the water is prohibited and must be reported to the National Response Center. Plastic may never go overboard anywhere, and other garbage is barred in U.S. navigable waters. In a no-discharge zone, an installed toilet must be secured so it cannot discharge, for example by padlocking or wire-tying its valve closed.

A personal watercraft steers by aiming its jet of water, and the NTSB's 1998 study found that releasing the throttle leaves little or no steering and no brakes, so the craft coasts straight on. Letting go and then turning is the instinctive wrong move; a controlled turn under power is how you avoid a hazard. Falls and rollovers are expected, which is why a lanyard ties the kill switch to the rider.

The zone is a 500-yard area around U.S. naval vessels longer than 100 ft, whether they are under way, anchored or moored. Inside it you must hold the lowest speed that still lets you steer a safe course, and you may not come within 100 yards without permission, which you request from the Coast Guard or naval patrol on VHF channel 16. A violation is a felony.

The federal trigger is propulsion machinery of any type, not hull size, and the number comes from the state where the boat is operated most during the year. Boats used only for racing can be exempt, and a federally documented boat is outside the numbering rule. States may go further and require numbers on boats with no motor at all, so check the state where you operate.

The spacing rule keeps the number readable: each gap between the state letters, the digits and the suffix letters must be a space or hyphen as wide as one letter other than an “I” or digit other than a “1”. Suffixes never use I, O or Q, which look like numerals. Characters must be in plain vertical block style, no shorter than 3 inches, in a color that contrasts with the hull.

Numbers go on both sides of the forward half of the hull, painted on or permanently attached, so someone approaching from either side can read them. Where the hull shape would hide them, they go on a backing plate fixed to the forward half. No other number may be shown on the forward half, which keeps the official one from being confused with anything else.

Where a state issues validation stickers, each one sits within 6 inches of the number, and the expiry year is shown by color, with blue, orange, green and red used in rotation, so a current or lapsed registration shows at a glance. The sticker comes off along with the number when the boat is documented or moves to another state.

The certificate must be aboard, on paper or in digital form, whenever the boat is used, and you must hand it to any federal, state or local officer who asks. One exception covers rentals: for a boat under 26 ft rented for less than 7 days, the owner may keep the certificate ashore and the renter carries the signed rental agreement instead.

The owner named on the certificate must tell the issuing state within 15 days of a change of address, a theft or recovery, a lost certificate, a transfer of ownership, or the boat's destruction or abandonment. Several of these also make the certificate invalid, and an invalid certificate must be surrendered within 15 days, so the record follows the boat rather than a former owner.

A boat numbered in one state is treated as compliant while it is temporarily operated in another, so a visit needs no new number. Moving the boat's principal use to a new state is different: the new state honors the old number for 60 days, after which the old certificate is invalid and the boat must be numbered there.

Documentation is a federal alternative to state numbering, open to boats of at least five net tons owned by U.S. citizens. A recreational documented boat shows its name and hailing port together on the hull in letters at least 4 inches high, with its official number marked inside, instead of state numbers. Some states still require a documented boat to register and carry a decal.

Each part of the 12 characters answers a different question: the first three identify the manufacturer, the next five are its serial number, the ninth and tenth give the month and year of certification, with the month as a letter, and the last two give the model year. No slashes, hyphens or spaces are allowed, and the serial skips I, O and Q.

The primary number goes on the starboard outboard side of the transom, within 2 inches of the top, and an identical duplicate is placed in an unexposed spot inside the boat or under a fitting. Both are carved, molded or otherwise fixed so that removal or alteration would be obvious, and neither may sit on a removable part.

Before a boat leaves the factory for sale, the builder must attach a label naming the manufacturer and stating that the boat met the Coast Guard safety standards in effect on its certification date. Those standards cover areas such as capacity marking, flotation, electrical and fuel systems, and ventilation. The label must survive weather, show tampering, and stay on the boat.

A manufacturer or dealer testing or demonstrating a boat may show the number on removable plates fixed temporarily but firmly to each side of the forward half. That is the one case where the number need not be painted on or permanently attached to the hull itself.

A written report is required when a casualty involving the boat or its equipment causes a death, an injury needing treatment beyond first aid, someone missing in circumstances that point to death or injury, damage at or above the federal threshold, or the complete loss of a boat. The injury test is the treatment needed, not how bad it looked, and states may set a lower damage threshold.

Deaths and disappearances need notice without delay, by the quickest means, to the nearest reporting authority. A written report is then due within 48 hours when a person dies within 24 hours, needs care beyond first aid, or disappears; every other reportable casualty, including a later death or damage alone, has 10 days. The quickest clocks follow the cases where a life may still be at stake.

The operator, the person in control of the boat, files the report. If the operator cannot, the owner must. For a death or disappearance, if the operator cannot give the immediate notice, each person aboard must give it or confirm that someone has, so the duty does not lapse with an injured or missing operator.

Every state is the reporting authority on its waters, so reports go to a state agency rather than a federal office. The default is the state that numbered the boat, or where an unnumbered boat is mainly used; a casualty in some other state is reported there instead. States forward each report to the Coast Guard within 30 days.

Besides who, where and when, the report records conditions, including visibility, weather, water and estimated air and water temperatures, the forecasts the operator used, whether life jackets were available and worn, any equipment failure, and the reporter's opinion of the cause, including any role of alcohol or drugs.

The duty has a built-in limit: help anyone found at sea in danger of being lost as far as you can without seriously endangering your own boat or the people aboard. It is a legal obligation, not a courtesy, and a master who fails to give that help can be fined or imprisoned.

As after a road crash, a marine casualty triggers an exchange: the person in charge gives name, address and vessel identification to the operator of any other boat involved, to anyone injured, and to the owner of any damaged property. Failing to do so is a federal offense punishable by a fine or imprisonment.

Someone who helps at a marine casualty in good faith, without pay and without objection from the person helped, is not liable for damages from that help. The shield has a condition: you must act as an ordinary, reasonable and prudent person would in the circumstances, so careless or unreasonable help falls outside it.

Accident reports are used to set regulations and safety standards, find and fix boat defects, educate boaters and measure whether safety programs work. The Coast Guard trusts its fatality counts but says non-fatal incidents are badly under-reported, with true damage and injuries likely many times what reports show, so the record is least reliable for non-fatal incidents.

Under the Navigation Rules a vessel of 12 meters or more must carry a whistle, and one of 20 meters or more a bell as well. A smaller boat need not carry either, but it must have some other way to make an efficient sound signal, and in restricted visibility, if it does not give the standard fog signals, it must sound that other signal at least every 2 minutes.

Backfire flame control sits on the engine's air intake, secured with a flame-tight connection. It is required on gasoline engines installed in motorboats since 1940, except outboards, and must be Coast Guard approved or marked to a recognized standard. Other accepted means include the air and fuel induction systems found on personal watercraft.

Natural ventilation needs a supply opening from outside air and an exhaust duct or opening, with the exhaust starting in the lower third of the compartment and both above normal bilge water. A powered exhaust blower is added only where a permanently installed gasoline engine has a cranking motor, and a compartment open to the atmosphere needs neither.

Recreational boats show navigation lights from sunset to sunrise and in restricted visibility such as fog, rain or haze, and no other light may be shown that could be mistaken for them or spoil the lookout. The pattern depends on whether you are under power, under sail or under oars, and a sailboat or paddle craft using a motor counts as power-driven.

Types I and II treat sewage before discharging it, Type II to a stricter standard, while Type III holds sewage aboard so that none goes overboard. Boats over 65 ft cannot use Type I. In a no-discharge zone a Type I or II must be secured, for example by closing the seacock and removing its handle or padlocking it shut.

Two placards apply at 26 ft: an oil placard in the machinery space or at the bilge pump station, and a garbage placard posted where crew and passengers can read it. Both restate the law rather than create it, so a smaller boat is bound by the same discharge bans even though it carries no placard.

The Coast Guard does not regulate anchors, so choosing one is your decision rather than a matter of federal approval. It is still the tool that stops a disabled boat drifting onto a hazard, and severe-weather advice includes anchoring when needed. Carry enough line for five to seven times the depth plus the height of the bow.

Most recreational boats under 65.6 ft need no radio, but a VHF call on channel 16 reaches the Coast Guard and nearby boats at once, and a DSC set linked to GPS can send your position automatically. The Coast Guard does not recommend a cell phone as a substitute for marine distress radio. A radio you carry voluntarily must keep watch on channel 16 or 9 whenever it is on and not in use for a call.

The same tests recur across the carriage rules: approved, in serviceable condition, and readily accessible. Each item has its own checks, such as an extinguisher's gauge in range and lock pin in place, a life jacket's straps and foam intact, and a flare within its date. An item that fails does not count toward the requirement, though expired gear may stay aboard as an extra.

Federal rules set a floor. States keep their own laws on life jacket wear for children, canoe and kayak paddlers, sailboarders and PWC riders, may apply their own alcohol limit, may require reports for smaller damage, and may number boats with no motor. A boat that meets every federal rule can still break the law of the state whose waters it is on.

Coastal waters means the U.S. Great Lakes, the territorial sea, and bays, rivers and other waters connected to them whose entrance is wider than 2 nautical miles, up to the point where the waterway first narrows to 2 miles across. Upstream of that point the federal signal rule no longer applies, though carrying signals is still recommended wherever you boat.

These boats may skip day signals but must still carry night signals between sunset and sunrise: boats under 16 ft, boats in organized races, regattas or parades, open sailboats under 26 ft without engines, and manually propelled boats. The exemption is about hours, not size alone, so a small boat out after dark is covered.

Red flares, hand-held or aerial, meet both the day and the night requirement, while orange smoke, hand-held or floating, counts for day use only. Aerial meteors and parachute flares may need an approved launcher, which must then be carried too. Each device burns for a different time, so read the label and choose for the conditions where you boat.

If you rely on pyrotechnics you need at least three for day use and three for night use, and a device rated for both counts toward each. That is why three hand-held red flares alone can meet the whole rule, while orange smoke must be paired with a night device such as an electric distress light. No single device suits every condition.

The orange distress flag, at least 3 by 3 ft with a black square and ball, counts by day only and shows best waved on a paddle or flown from a mast. An electric distress light that flashes SOS counts at night only. A plain high-intensity white light flashing regularly is a recognized distress signal under the Inland Rules but does not meet the carriage rule.

A signal counts only if the service life marked on it has not run out, so check the date on every pyrotechnic, not just whether it looks intact. Expired flares may stay aboard as extras, but they do not count toward the requirement, so a boat carrying only out-of-date flares is short of signals even with a full box.

Signals must be readily accessible, because they are needed at the moment something has gone wrong. Store pyrotechnics in a cool, dry place where possible, and a watertight container painted red or orange and marked “DISTRESS SIGNALS” or “FLARES” is recommended so anyone aboard can find it quickly.

Pyrotechnic signals burn with a very hot flame that can cause burns and ignite flammable material, so treat them as a hazard even when used correctly. Pistol-launched and hand-held parachute flares behave much like firearms and some states treat them as firearms, so check your state's rules; disposing of old flares can also be restricted.

On channel 16, say MAYDAY three times, “this is” and the boat's name three times with its call sign or registration, then MAYDAY and the name once more. Next give your position by latitude and longitude or by bearing and distance from a landmark, the number aboard, what is wrong, the help you need and a description of the boat, then “over.”

Pick the signal by the threat. MAYDAY is for distress needing immediate help. PAN-PAN marks a very urgent message about the safety of a vessel or person and outranks everything except distress; stations hearing it must keep listening for three minutes. SECURITE comes before a navigation safety message or a weather warning.

A DSC radio sends a formatted distress alert with your identity and position when you hold its red distress button for 5 seconds, but only if an MMSI number has been obtained and entered and a GPS is connected to feed it position. Without them the alert cannot say who or where you are. If no acknowledgment comes, switch to voice on channel 16.

A 406 MHz beacon transmits a unique code that the satellite system checks against its registration record, so rescuers learn whose beacon it is, the boat and who to contact; a beacon with GPS also sends a position almost at once. Registration with NOAA is mandatory, must be renewed every two years, speeds the response and cuts false alarms.

It is unlawful to send a false distress alert on purpose, or to leave an accidental one uncancelled. If you set off a DSC alert by mistake, reset the radio and broadcast a cancellation to all stations on the distress channel, giving the boat's name, call sign, MMSI and the time the alert went out. Repeated alerts or a false identity are also violations.

Check the forecast before leaving and keep checking afloat, because most marine forecasts update every six hours and conditions can change faster. Coastal waters and offshore forecasts are separate products for different distances from shore, and the Weather Service names NOAA Weather Radio, not the internet, as the dependable source. A forecast wave height is an average; some waves run about twice as high.

Above the advisory, the ladder is set by wind speed outside tropical cyclones: a gale warning means sustained winds or frequent gusts of 34 to 47 knots, a storm warning 48 to 63 knots, and a hurricane force wind warning 64 knots or more. A small craft advisory has no single threshold; it varies by region, and any boat that those conditions could hurt counts as small craft.

A watch means the risk is up or conditions are favorable but timing or location is still uncertain, so prepare and keep checking. A warning means the hazard is reported, occurring or imminent, usually over a smaller area, so act. Marine products follow the same logic: a gale watch flags a raised chance of gale-force winds before a gale warning is issued.

Puffy clouds growing taller, dark clouds especially to the west or southwest, a sudden temperature drop, rising or shifting wind, flashes on the horizon and heavy static on an AM radio all point to an approaching storm. If thunderstorms are forecast, the Weather Service advice is not to go out; a severe one can bring gusts over 58 mph.

Most lightning injuries and deaths on boats happen on small boats with no cabin. If you cannot reach land, anchor and get as low as possible; on a boat with a cabin, stay inside, away from metal surfaces, and off the radio except in an emergency. Once ashore, the Weather Service's general outdoor advice is to let 30 minutes pass after the final rumble of thunder before heading back out.

A dense fog advisory means visibility often drops to a quarter mile or less, which is a strong reason not to leave. If fog catches you, slow to a safe speed at which you can stop within a distance suited to the conditions, keep a lookout by sight and hearing, show navigation lights, and make the sound signals the Navigation Rules require for restricted visibility.

Tidal range is the rise and fall between high and low water, and it changes the depth over every shoal you cross. The horizontal flow, flood coming in and ebb going out, is usually strongest around high and low tide and weakest at slack water, and near inlets and narrow straits it can run several kilometers per hour. Spring tides near new and full moon widen the range.

When a current runs against the seas it shortens the distance between waves and raises their height, so they turn steep, close together and quick to break. The Weather Service notes that strong currents, as around jetties or in the Gulf Stream, can raise wave heights well above the general forecast, and for a small boat the danger grows as the time between waves shortens.

Large waves need all three at once: strong wind, blowing for a long time, across a long fetch, the distance of water the wind crosses in one direction. Remove any one and waves stay small, however hard the wind blows. That is why water close to the shore an offshore wind blows from stays fairly calm: the land limits its fetch.

Plan to use one third of the fuel going out, one third coming back, and keep the last third untouched. The reserve is a margin meant to stay in the tank, not extra range for going farther, so turn back once the outbound third is used.

A checklist exists because the costly omissions are small ones, like a missing drain plug. Before every trip, confirm the required gear is aboard, serviceable and understood, check the weather, and leave a float plan. A free Vessel Safety Check by volunteer examiners can confirm the equipment side before the season.

Passengers cannot use gear they cannot find, so before leaving show where the life jackets and safety equipment are and how they work. Account for everyone before starting the engine, point out propeller hazard areas, and set rules for the swim platform, boarding ladder and seating, including no riding on the bow, gunwale or transom.

A GPS gives your latitude and longitude but cannot show what is around or beneath the boat; a chart shows depths, hazards, the bottom and aids to navigation. Charts need constant updating as people and nature change the waterway, and some electronic chart providers update less often than others, so an old card can show water that has changed.

Storms and wave action can drag buoys out of place, and the waterway changes between chart updates, so never fix your position by aids to navigation alone. Learn the area's local hazards too, such as low-head dams on rivers and the security zones around ports, power plants and other facilities on the water.

A displacement hull always pushes water aside, and its top speed is set by waterline length: past about 1.34 times the square root of that length in feet, in knots, extra power buys almost no speed. A planing hull starts the same way, then lifts onto the surface, where a little more power adds a lot of speed. A semi-displacement hull rises only partway and never fully planes.

At rest a boat's pivot point usually sits just forward of amidships, and it moves forward as speed builds. The rudder or drive turns the boat by pushing the stern the opposite way from the bow, so the stern can sweep through more distance than the bow. Before turning away from a dock, check that the stern will clear it; outboards and stern drives kick the stern out even harder.

A propeller pushes the stern sideways as well as driving the boat: with a right-handed propeller the stern tends to starboard going ahead and to port going astern, and a left-handed one does the opposite. Backing is where it bites, because the rudder does little until the boat gathers sternway, and a hard burst astern swings the stern sharply, so build sternway gently.

Ramming the throttle forward makes the stern squat and the bow rise, cutting your view ahead just as speed builds. Slight bow-down trim shortens the climb onto plane and lowers the bow; adjust trim tabs in short bursts, since over-trimming at speed makes handling unpredictable. Bring power off gradually too: a sudden cut drops the hull back hard, like braking a car.

Federal law penalizes operating a boat in a negligent manner that endangers life, limb or property, and Coast Guard guidance lists excessive speed near other boats as one example; gross negligence is a crime. The Navigation Rules add that obeying their letter never excuses neglecting ordinary good seamanship, so staying within a legal speed is no defense if your wake hurts someone.

In rough water, slow to just enough power to keep headway and take the waves at about 45 degrees off the bow rather than straight on, with passengers seated low near the centerline. Wave steepness matters as much as height: for a small boat, danger rises as the period between waves shortens. If the engine fails, a sea anchor off the bow keeps it pointed into the waves.

In a following sea, a boat that surfs down a wave face slows as its bow digs into the trough; the rudder loses grip, the sea takes charge of the stern, and the boat can yaw broadside into a broach. Cutting power as the stern lifts makes that shift worse. In big seas, ride the back of the wave ahead, matching its speed, and keep watching astern for the next one.

At an entrance, waves feel the bottom and steepen, and a current running against the seas shortens and raises them until they break more often. Learn where waves break, where the channel really is and how deep it is at this tide, and cross during a lull between wave sets. Coming in against a head current, waves overtake you faster, so stay on the back of the wave ahead.

Waves slow as they reach shoaling water, so their crests bend toward the shallows, steepen and finally break where the bottom rises, which is why breakers mark a shoal, bar or reef. Charted depth is only a starting point: the real depth can differ with the tide, the water stage, recent rain and air pressure, and shoaling can narrow a channel.

Grounding was one of the five most common primary incident types in the Coast Guard's 2024 data. Before trying to power off, know the tide: on tidal water the depth rises and falls between high and low water, so waiting may float you free or, on a falling tide, leave you harder aground. If someone needs care beyond first aid or the damage reaches the reporting threshold, a written report is due.

A longer towline sags in the middle, and that sag absorbs jerks before they reach the fittings. Nylon can stretch up to 40 percent more before it parts, so a line or fitting that fails under load snaps back like a rubber band; never stand in line with a towline under strain. Keep below the towed boat's hull design speed, because towing too fast has sunk boats.

Approach the spot slowly into the wind or current and lower the anchor rather than throwing it; in a strong current the rode can be too much to hold by hand, so take a turn around a cleat or bitt to control it. Once set, the boat swings as wind and tide change, so watch bearings on two landmarks: a steady compass heading with changing bearings means the anchor is dragging.

Carbon monoxide from the boat beside you can be as deadly as your own, and it can linger after engines stop, so rafted boats need the same CO watch as a single one. Choose the spot carefully: do not raft up in a channel or stop under a bridge, where you block traffic and can expect to be told to move.

From sunset to sunrise you must show navigation lights and no others that could be confused with them. Safe speed at night must take account of background light from shore and the back scatter of your own lights, and alcohol further reduces night vision, depth perception and color perception.

In or near restricted visibility every vessel keeps a safe speed, with a power-driven one's engines ready to maneuver, a lookout by sight, hearing and every available means, and the required fog signals; a boat under 12 meters may instead make another efficient sound signal every 2 minutes. Hearing a fog signal ahead of the beam means slowing to the least speed that keeps you on course, unless you know there is no risk of collision.

Where national park waters allow towing, someone at least 12 years old must ride along to watch the person being towed, besides the operator, and the boat must have room to carry everyone it tows. The reason is simple: the driver's eyes belong ahead, and a person in the water may not be visible from the helm. Other waters set their own rules, so check the state's.

Propeller guards help but do not suit every boat, so the Coast Guard calls shutting the engine off the best and safest step whenever people are in the water near you. National park rules go further and forbid running an engine or generator while anyone sits on or hangs from the swim platform or ladder, and Coast Guard carbon monoxide advice warns against the back deck too.

Coast Guard propeller guidance says never back up to pick someone out of the water: circle around going forward and keep the person in sight the whole time. Keep them on the operator's side of the boat and shut the engine off as you close in. National park rules also set flat-wake speed within 100 feet of a downed skier, unless the state's own rule differs.

The Coast Guard lists ski and diver flags among the things it does not regulate, so whether you must raise a flag when a rider falls, and what it must look like, comes from the state you are boating in. What federal park rules do set is behavior around the rider: no faster than flat-wake speed within 100 feet of a downed water skier, unless the state sets different conditions.

A life jacket's label can warn that it is not approved for water skiing, tubing, wakeboarding or personal watercraft use, so read the warnings before you hand one to a rider. National park rules require anyone being towed to wear a Coast Guard approved Type I, II, III or V device. Check the state's own towed-sports rules as well.

A three-blade propeller turning at 3,200 rpm can strike about 160 times a second, and the Coast Guard says most propeller deaths and injuries involve open motorboats 16 to 25 feet long and come from operator inattention, inexperience and carelessness. Guards help but do not fit every boat, so the surest step near swimmers is shutting the engine off; the cut-off link stops it if the operator is thrown clear.

Exhaust can collect at the stern and under the swim platform, and carbon monoxide can be present when you smell nothing, so the Coast Guard says never sit, hang on or teak surf at the back while engines run. CO can also linger after an engine stops, so ventilate the space under a platform before anyone enters it.

A swimmer in electrified water may feel tingling or cramps, or be unable to move at all, and a drowning near a dock can have an electrical cause that leaves no visible burn, because the water carries the heat away. CPSC's first step when someone is being shocked is to turn off all power, since otherwise rescuers can become victims too. CDC points to regular ground-fault inspection of docks as the prevention.

In national park waters you may not run a power or sail boat within 100 feet of a diver's flag unless you are tending the dive, and then only at flat-wake speed; divers must stay within 100 feet of their flag. Operating in a designated swimming area is one of the Coast Guard's examples of negligent operation. Outside park rules, the Coast Guard does not regulate dive flags, so state law sets them.

The letter on an extinguisher names the kind of fire it is built for and the number the amount of agent. Class B covers burning gasoline, oil and grease, which is why every required boat extinguisher carries a B rating. A marking like 1-A:10-B:C also covers ordinary combustibles and live electrical gear, and a C rating means the agent does not conduct electricity.

Alert everyone aboard first. The U.S. Fire Administration's test for fighting a fire yourself is that it is small and contained, you are clear of its smoke, and you have an escape route; then pull the pin, aim low at the base, squeeze, and sweep side to side. If the fire is beyond that, a MAYDAY call on channel 16 names the nature of the distress, such as fire.

Gasoline vapor trapped in an engine space is what can explode, so gasoline boats must have ventilation, the blower should run at least four minutes before a start, and inboard gasoline engines carry a backfire flame arrestor on the air intake. A boat with a Coast Guard approved fixed extinguishing system in the engine space may carry fewer portable extinguishers.

Coast Guard advice for an engine failure in severe weather is to stream a sea anchor from the bow, even a bucket, to keep the bow into the waves, and to anchor if needed. If the Coast Guard judges a channel 16 call to be non-distress, it offers to contact a commercial provider or a friend, or broadcasts the request so another boater can offer help.

Federal law requires the person in charge of a boat in a collision to give whatever help can be given without serious danger, and to give their name, address and boat identification to the other operator, anyone injured and owners of damaged property. A good-faith helper acting reasonably is shielded from liability. A death, a disappearance, an injury needing more than first aid, or damage over a set dollar amount also requires a report.

Stop the boat, alert the crew and nearby boats, keep the person in sight, and throw a life ring or other flotation. Return by circling around going forward, never in reverse, keep the person on the operator's side, and shut the engine off as you come alongside. NIOSH adds a sling, ladder or other boarding device to help them back over the rail.

In the first 10 minutes or so in cold water, hands, arms and legs become harder to use and swimming can fail, so do not count on a person climbing a ladder unaided. NIOSH finds a rescue sling works better than a life ring for getting someone back aboard, and a block and tackle or hauler can do the lifting. Practice the method before you need it.

A capsized boat will likely float on or just below the surface, and smaller outboard boats built after 1978 are designed to support you even when full of water or capsized. Getting in or on the boat keeps more of your body out of the water, which matters because cold water drains body heat fast. If you cannot climb on, a life jacket keeps your head above the water.

For a medical emergency afloat, the Coast Guard's distress format asks for a position rescuers can use: latitude and longitude, or a bearing and distance from a well-known landmark, plus how many people need medical attention and the kind of help you want. A DSC radio connected to GPS and registered with an MMSI sends your position automatically.

Irritated eyes, headache, nausea, weakness and dizziness are easy to mistake for seasickness or drink. Move the person to fresh air, shut off the source, give oxygen if you carry it, and get medical help, starting CPR if they stop breathing. Whoever goes in after them can be overcome too, so ventilate the space as you go.

Builders of small monohull outboard boats must pass a level-flotation test: swamped, the boat must float nearly level, heeling no more than 10 degrees. Small inboard and sterndrive boats must keep some part above water after 18 hours swamped and loaded. That is why staying with a swamped small boat makes sense, but sailboats, canoes, kayaks and inflatables are outside these rules.

Federal build standards for gasoline inboard boats call for fuel hoses marked with their Coast Guard type and year, clamps of corrosion-resistant material that do not rely only on spring tension, and fill hoses held by a swaged sleeve or two clamps. After fueling, the Coast Guard's check is your nose: sniff the bilge and engine space, and do not start until no gasoline odor remains.

On gasoline inboard boats, each tank vent must carry a flame arrester, and the vent and fill opening must be placed so overflow at a set rate does not run into the boat. That means fuel pushed out of a full tank goes over the side instead, and an oil discharge that leaves a sheen on the water is prohibited under federal law. Keep the nozzle in contact with the fill and wipe up any spill.

An E10 blend can hold about half a percent water at 60 degrees F, far more than plain gasoline, but past that point the water separates and pulls ethanol with it into a layer at the bottom. That layer can strip a two-stroke's lubrication or make a four-stroke run lean, and free water drawn in can keep an engine from running. EPA notes it mostly happens when liquid water gets in, such as through an open vent.

Coast Guard standards for gasoline inboard boats say an installed battery may not shift more than an inch under a pull of 90 pounds or twice its weight, whichever is less, its live terminals must be guarded against stray metal, and its hydrogen must be vented. It may not sit directly above or below a fuel tank, filter or fitting, keeping sparks away from fuel.

Under the federal electrical standard for gasoline inboard boats, each ungrounded conductor needs a manually reset breaker or fuse at its power source, or within 7 inches, or 40 inches if sheathed, when the source is impractical. Listed exceptions include the cranking motor feed. Electrical parts near gasoline sources must be ignition-protected or isolated, so a spark cannot set off fuel vapor.

NIOSH tells vessel owners to inspect and maintain the hull and every through-hull penetration, keep doors and hatches closed underway in rough seas, and test high-water alarms before each trip. Its research also treats minor flooding as a warning sign, since such casualties are risk factors for later vessel disasters.

The Coast Guard's carbon monoxide checklist starts each trip by confirming water flows from the exhaust outlet when engines and generator start, and listening for any change in exhaust sound. Once a year, have a marine technician inspect the water pump impeller and housing, replacing them if worn, since a failing cooling or exhaust system can also leak carbon monoxide.

Federal boating rules give no tongue-weight figure, so take it from the trailer and hitch makers' ratings. What the Coast Guard does say about loading a boat is to spread heavy gear evenly fore and aft and side to side, keep it low, and secure it so it cannot shift. Gear that slides while you tow moves weight toward or away from the hitch, so secure it for the road as well.

Federal motor-carrier rules, which bind commercial vehicles, show what a safety connection is for: on a trailer drawn by a tow-bar it must hold the full towed weight, have no more slack than turning needs, attach apart from the hitch device, and keep the tow-bar from dropping to the road if it fails. A boat trailer's chains do that job, but state law sets the rules for a private trailer.

Where a commercial trailer must have brakes, federal motor-carrier rules require them to apply automatically and immediately if the trailer breaks away, and to stay applied for at least 15 minutes. That is a breakaway system's job: it stops a trailer that has left the hitch behind. State law decides which private boat trailers need brakes, so check yours.

Federal motor-carrier rules require every required lamp on a commercial trailer to work at all times and not be hidden by the load or by dirt. The same check suits a boat trailer: before each drive, have a helper confirm the brake, tail and turn lamps respond from the tow vehicle. State law sets the towing rules for a private boat trailer, so check yours.

Federal motor-carrier rules show the logic for trailer tires: a tire may not carry more than the load marked on its sidewall, inflation is judged cold because a highway run raises the pressure, and a tire labeled for 55 mph or less must not be driven faster. Those rules bind commercial vehicles; state law covers a private boat trailer, but the same three checks fit it.

A launch ramp is shared, regulated space: in national parks you may launch or haul out only at designated sites and must slow to flat-wake speed within 100 feet of one unless state law differs, and Army Corps lakes bar swimming at launch sites and fishing from ramps. Getting the boat ready before you back down keeps the ramp clear for the next boater.

Some parks and states require drain plugs out while you tow, so the boat drains and dries between waters. That is why putting the plugs back belongs at the top of a launch checklist, before the boat goes down the ramp. The Coast Guard names forgetting the drain plugs as exactly the kind of mistake a few minutes with a checklist prevents.

Army Corps of Engineers lakes bar swimming at launch sites and fishing from boat ramps, and national parks require flat-wake speed within 100 feet of a designated launch site unless state law differs. A ramp puts backing vehicles, moving trailers and maneuvering boats in the same few yards of water, so a person in the way there is hard to see.

Before you leave a launch, pull plants, mud and animals off the boat, trailer and gear, drain every compartment that holds water, and leave the plugs out for the drive. Parks advise high-pressure hot water, and Lake Mead cites water above 140 degrees as proven against quagga mussels; Yellowstone adds a 30-day dry time for some boats because a wash is not always enough.

EPA counts any oil discharge that leaves a film, sheen or discoloration on the water, or a sludge beneath it, as harmful, so the test is what you can see, not how much spilled. Whoever is in charge of the boat must notify the National Response Center at once; the Coast Guard asks for location, amount, color and source.

Boats with engines must be able to hold oily bilge water aboard and take it ashore, and a bucket, absorbent pads or a portable pump can meet that. Adding soap or another agent to break up a sheen does not make the discharge legal: EPA bars using any substance to get around the oil ban. Draining oil into the bilge is prohibited too.

Plastic, including synthetic rope and fishing net, may never go overboard anywhere, and no garbage at all may be discharged in U.S. navigable waters, the Great Lakes and inland waters included. Farther out, what may go over depends on the type of garbage and the distance from land, and food waste may go closer in only after it is ground. States may restrict more.

A no-discharge zone bans even treated sewage, and one way a state gets one is by showing EPA that pumpout facilities are reasonably available. Inside it, secure a Type I or II toilet so it cannot discharge, for example by closing the seacock and removing the handle or wire-tying it shut. In other coastal waters, treated sewage may go over near shore, while untreated sewage must wait until well offshore.

Federal rules let deck and hull wash water go overboard only when its cleaning agents and additives are not harmful to the marine environment. Soap is never a fix for spilled oil: EPA forbids adding any agent to oil to get around the discharge ban, so a detergent that hides a sheen adds a violation instead of removing one.

Zebra and quagga mussels and other invaders ride in anything that holds water or mud: motors, bilges, live wells, ballast, anchors and trailers. Clean off plants, animals and mud, drain every compartment, and dry everything before the next lake. Prevention matters most because, as Yellowstone notes, there is no effective way to eradicate mussels once they are established.

NOAA's guideline is at least 100 yards from whales and 50 yards from dolphins, seals, sea lions and sea turtles, more in some places, with no more than 30 minutes of watching. Some distances are federal law, such as 500 yards from North Atlantic right whales anywhere in U.S. waters, and harassing protected species is prohibited. Rules vary by state and species.

Florida Keys sanctuary rules bar anchoring on living coral and running a boat so that it scars seagrass. Shallow prop scars may regrow from the edges, but scars deeper than 5 to 6 inches usually do not and can widen in storms. If you find yourself too shallow, stop, shut the motor off, tilt it up and wait for the tide instead of powering out.

In one NOAA modeling study of a narrow stretch of the Intracoastal Waterway in North Carolina, V-hull boats above 7 knots made wakes that moved far more nearshore sediment than natural wind waves. Wakes were worst at 10 knots, while the boats plowed before planing, and slowing large boats to about 7 knots was projected to cut erosion-causing wakes substantially.

National park rules cap vessel noise at 75 dB(A) underway and 88 dB(A) when stationary, each measured by a set SAE test, and an authorized person who suspects a loud boat can order an on-site test. Other waters may set their own limits, so a boat that passes in one place can still be cited somewhere else.

Most fires and explosions happen during or just after fueling, and the same habits prevent spills: refuel portable tanks ashore, keep the nozzle in contact with the fill and wipe up any spill. On gasoline inboard boats, vents are built so overflow does not enter the boat, so an overfilled tank sends fuel onto the water, where a sheen counts as a reportable discharge.

An abandoned boat can block channels, damage habitat and shed debris for years, and it is among the costliest kinds of marine debris to remove. Abandoning it does not end the owner's duties: a numbered boat's owner must report abandonment to the issuing agency within 15 days, and national park rules make owners remove a sunken, grounded or disabled boat.

The Coast Guard's authority comes from 14 U.S.C. 522: its officers may board any vessel subject to U.S. jurisdiction, at any time, to make inquiries, inspect papers and search. The Coast Guard describes boardings as routine checks on the safety of those aboard, and they cover kayaks, canoes and personal watercraft. Federal, state and local marine officers may board your boat too.

When a Coast Guard vessel hails you, you must heave to, meaning stop, or maneuver as directed so the team can come aboard. Expect radio questions about your route and how many are aboard, then two to four armed officers who will ask about weapons, look for obvious hazards, and inspect your papers and equipment.

After a first look for obvious hazards, the boarding officer checks registration or documentation, then each required item in detail: life jackets, fire extinguishers, visual distress signals and the rest. Life jackets are the item cited most often, and each is checked for approval, condition, proper stowage and the right size for each person aboard.

Federal law lets an officer act when a boat is short of lifesaving or firefighting gear, overloaded, or in another unsafe condition defined by regulation. Those regulations add missing navigation lights at night, an operator apparently impaired by alcohol or drugs, fuel leaking or pooled in the bilge, and ventilation or backfire flame control that fails the standards.

Termination is for a hazard the officer judges cannot be fixed on the spot. You may be told to correct it immediately, go to a mooring, dock or anchorage, or stop using the boat until it is fixed. Refusing brings a citation for failing to comply on top of the original violation.

Operating so as to endanger lives or property can bring a federal civil penalty, and gross negligence is a criminal offense. The Coast Guard's examples include running in a designated swimming area, speeding near other boats, hazardous water-sports practices, riding on the bow, gunwale or transom, and operating under the influence.

When a builder learns that a boat or covered equipment fails a federal standard or has a defect creating a substantial risk of injury, it must notify first buyers, known later owners and dealers, describe the hazard, and undertake to fix it at its own cost. The owner notice covers defects found within 10 years of certification or manufacture, and the Coast Guard's recall database is worth checking before you buy a used boat.

A Vessel Safety Check is a free courtesy exam by the Coast Guard Auxiliary or the Power Squadrons, and it is not a law enforcement action. Examiners look over the equipment and condition that federal and state rules require, explain what each item is for, and give a decal to boats that pass.

Boater education requirements, such as age cutoffs and cards, come from state law and differ from state to state; even national park rules adopt the state's requirement. The Coast Guard's reason for urging a course is in its data: on average, 74 percent of fatal boating incidents happen on boats whose operator had no formal instruction.

Federal law sets a protection zone around U.S. naval vessels, with a distance you may not enter and a wider one where you must slow to minimum speed; if you need to pass closer, call on channel 16 for permission. Also keep clear of security zones around cruise ships and port and petroleum facilities, and report suspicious activity to America's Waterway Watch.