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Two highs, two lows

Most of the U.S. East and Gulf coasts are semidiurnal — two high tides and two low tides a day, roughly six hours apart. Parts of the Gulf run diurnal (one high, one low a day) or a mix of the two. Your station's pattern is the first thing to know about it.

Springs, neaps & king tides

At new and full moon, sun and moon line up and the range stretches — those are spring tides; the quarter moons bring the smaller neaps. When a spring tide lands with the moon at its closest point (perigee), six to eight times a year, highs can run a foot or more above an ordinary spring — the so-called king tides.

Why it runs your day

On the ICW, the tide is depth and bridge clearance in one number. A five-foot-draft boat times shallow legs for high water; a tall mast does the same math against the bridges. Predictions are just that, though — wind and weather push real water levels off the table, so leave margin both ways.

Read LOA like a broker does

Length overall on a modern spec sheet usually includes the bow pulpit and swim platform. The hull underneath can be two feet shorter — which is why two “40-footers” live very differently. Compare hull length and beam, not just the number in the model name; model names are marketing, and plenty of “38s” are 41 feet overall.

Draft and air draft decide where you can go

Draft is how much water you need under you; air draft is how much bridge you need over you. Add your antenna and radar arch to the published figure, and remember published draft is often quoted with empty tanks. On the ICW these two numbers — not horsepower — decide your whole route.

“Standard” vs “optional” is where the money hides

A spec sheet lists everything the model can have. The joystick, Seakeeper, generator and second head may all be options the first owner never bought. Before comparing two used boats, get the original build sheet or option list for each hull — the database here records equipment as standard, optional, or not offered for exactly this reason.

Check engine hours at the ECM, not the gauge

Dash hour meters get replaced, disconnected and misread. Modern engines store true hours in their electronic control module, and a mechanic's diagnostic readout will show them — along with overheat and fault history. If the ECM hours and the gauge disagree, believe the ECM and ask why.

Run her at cruising speed — and at the pins

A real sea trial warms the engines fully, holds cruising rpm long enough for temperatures to stabilize, and briefly reaches the manufacturer's rated wide-open-throttle rpm with a normal load aboard. An engine that can't make rated rpm is over-propped, fouled, or tired — all three are negotiating points, and all three are invisible at the dock.

What a survey actually covers

A marine surveyor inspects the hull (including tapping and moisture-meter readings for delamination and wet core), through-hull fittings and seacocks, running gear, steering, electrical and fuel systems, and safety equipment — then sea-trials the boat. What a survey is not: an engine mechanical inspection. Budget for a separate engine survey on any serious diesel boat.

Scope: 7-to-1 for the night, and measure it right

Scope is rode length divided by the distance from your bow roller to the seabed — water depth plus freeboard, plus the tide still to come. Seven-to-one is the classic overnight standard in settled weather; a short 3-to-1 or 4-to-1 “lunch hook” set is fine for a calm swim stop with someone aboard. After setting, back down under power to prove the anchor is holding before anyone sleeps.

Slow is pro

Approach a dock at the speed you'd like to hit it — because sometimes you will. Use short bursts of power and long glides in neutral, and let wind and current do the work when they're helping. A spring line from a midship cleat is the solo docker's best friend: power gently against it and the boat walks itself alongside.

You are responsible for your wake

Under the navigation rules, a vessel is responsible for damage its wake causes — including boats torn against docks and people knocked down aboard. “No wake” means fully settled: bow down, no stern wave, steerageway only. Slow early, not at the sign; your wake was launched a hundred yards back.

Sixty-five feet is the number — with one famous trap

Fixed bridges on the Atlantic ICW are built to give about 65 feet of clearance at mean high water. The standing exception is Miami's Julia Tuttle Causeway at roughly 56 feet, which turns taller boats out to the ocean. Check the boards on the bridge itself: clearance is measured at the center span and falls as the tide rises.

Time the tide, don't fight it

Shallow legs ride best on a rising tide — if you touch, the water is coming up to free you. Tall-masted boats run the same bridges at low water for extra clearance. Build the tide tables for your stretch into the morning's plan, and remember wind can push real water levels a foot or more off the prediction.

Yellow marks outrank the colors under them

On the ICW, aids carry a yellow triangle (leave it to starboard heading south) or a yellow square (leave it to port) — and that yellow mark overrides the red or green beneath it, because ICW direction is defined by the route, not by “returning from sea.” The full marker system is laid out in the ICW Guide below.

The raw-water impeller is a yearly part

The little rubber impeller that pumps cooling water through your engine takes a set, cracks with age, and fails without much warning — usually underway. Most mechanics replace it annually or at the maker's stated interval, and keep the old one aboard as a spare. When one shreds, find every vane: the pieces lodge in the heat exchanger and cook the engine later.

Zincs are supposed to disappear

Sacrificial anodes corrode so your propellers, shafts and through-hulls don't — salt water plus dissimilar metals makes a battery, and the zinc volunteers to be eaten. Replace anodes when they're about half gone, never paint them, and check them more often in warm salt water and marinas with stray-current problems.

Exercise every seacock, every month

A seacock that hasn't moved in a year usually won't move in an emergency. Work each handle through its full swing monthly, check hose clamps in pairs (stainless, snug, not rust-stained), and keep a tapered wooden plug tied to every through-hull — sized to it — for the day a hose lets go.

Winterization is a checklist, not a chore

Work it in order: stabilize fuel and run it through; change engine and gear oil while warm; drain raw-water circuits or fill them with the right antifreeze; protect the fresh-water system and heads; fog or treat engines per the manual; ventilate against mildew; pull and store batteries charged. Write your own boat's list once, and every fall becomes an afternoon instead of a worry.

File a float plan — on paper, with a person

Where you're going, who's aboard, when you're due back, and what to do if you don't check in. Leave it with someone ashore who will actually make the call. The Coast Guard can't start looking until someone reports you overdue — the float plan is what turns “missing” into a search with a location.

Wear the kill-switch link

Federal law since 2021 requires the operator of most boats under 26 feet to wear the engine cut-off switch link while on plane or above displacement speed. Clip it to your belt or life jacket every time — a helmsman thrown from the controls leaves a boat that circles, and the link is the only thing that stops it.

Dinghy sense

The tender is a boat, not a toy: it needs its own registration where your state requires it, lights after dark, a kill-switch link, and life jackets aboard — most drowning accidents on cruising boats happen in the dinghy, close to the dock, after dark. Tow it on a short painter in harbor and a long one offshore, or lift it on davits; and size davits for the dinghy plus outboard, fuel and gear, not the bare shell.

Leave a float plan

Before you go, write down where you're headed, who is aboard, a description of the boat, and the time you expect to be back — and leave it with someone ashore you trust. If you aren't back by the stated time, that person calls the authorities. A float plan turns “overdue” into a search that starts in the right place.

Keep a vessel information sheet

One page, kept current, with the facts an emergency would need: owner and emergency contacts, insurance details, the phone numbers for the Coast Guard, local police and your marina, the boat's hull serial number, and your dealers. Keep a copy aboard and a copy with the person holding your float plan.

Pack the recommended gear

Beyond the legally required equipment, carry a working set of tools, the spare parts your boat is most likely to need, and basic gear and supplies for the trip you're actually making. Stow it all where it can be reached quickly, and check it before the season — gear you can't find, or that no longer works, doesn't count.

The skipper's standing rules

The operator is responsible for the boat and everyone on it. Never drink and drive. Learn the rules of the road and follow them. Know that “Mayday” is reserved for a vessel or person in grave and imminent danger. Inspect the boat and its equipment before getting underway, obey posted restrictions, carry paper charts as a backup, and keep passengers in proper seating areas while the boat is moving.

Boating and alcohol is a federal offense

Operating a boat while intoxicated — BUI — is a federal offense. The legal limit is a blood alcohol content of .08% in most waters (.10% in some states). A conviction can bring civil penalties up to $1,000, criminal fines up to $5,000, and up to a year in jail. Alcohol also slows reaction time and clouds judgment on the water faster than it does ashore.

How boating accidents happen

The same causes show up again and again: mixing boating with alcohol; crossing the deck walk-around to reach the bow at unsafe speeds; sitting on the bow, deck or swim platform while underway; going out in bad weather, especially high winds and thunderstorms; leaving the dock without checking fluids and systems, the fuel system above all; inattentive operation; broken emergency equipment; improper boat handling; running short on fuel or navigational aids in open water; and not wearing life jackets.

Reporting an accident — the deadlines

The operator is legally required to report a boating accident within 48 hours when it involves a death, an injury that needs treatment beyond first aid, or a passenger who disappears. When an accident causes more than $2,000 in damage, or the vessel is a complete loss, a formal report must be filed within 10 days.

When severe weather catches you

Work the sequence: slow down; get everyone into life jackets; switch on your lights; make for safe shore; take the waves at a 45-degree angle; move passengers low and to the center of the boat; keep the bilge pump clear and running; secure loose gear. If the engine fails, a sea anchor will hold the bow into the seas while you wait it out or call for help.

Running in fog

Slow down and post a lookout. Keep track of your bearings and maintain a log so you know where you are even when you can't see it. Sound a five-second horn blast every minute so other vessels can place you, get life jackets on, and keep a constant watch — eyes and ears — for traffic you may hear before you see.

Shallow water and grounding

Shoals shift and channels lie, so feel your way in unfamiliar water and watch the depth. If you strike something, check the boat for damage before running on. A new vibration underway is a warning sign of possible propeller damage — slow down and inspect at the first safe chance. If you run aground, stop, check everyone aboard, look for leaks or hull damage, and work the boat free gently rather than powering harder aground.

Fueling without the fire

No smoking and no open flames anywhere near the fuel dock. Shut down the engines and the electrical equipment, and send passengers off the boat while you fuel. When the nozzle is put away, ventilate the boat and run the blower for a full four minutes, then do the sniff test: check the bilge and engine spaces for fuel odor. If you smell gasoline, do not start the engine until the source is found.

The one-third fuel rule

Plan every run in thirds: one-third of your fuel to get there, one-third to get back, and one-third held in reserve for the weather, current, detour or headwind you didn't plan on. The reserve third is not range — it's your margin, and trips go wrong exactly when it's spent.

Carbon monoxide — where it comes from

Carbon monoxide is the odorless, colorless exhaust gas produced by engines and generators. It becomes deadly when exhaust escapes or is drawn back aboard: a blocked exhaust outlet can build CO up inside the boat, and exhaust can curl into the cockpit and cabin — the “station wagon effect.” Never sleep aboard with an engine or generator running, and keep people out of confined spaces where exhaust can collect. Heed the danger and warning labels aboard: CO can kill without warning signs you can smell.

CO symptoms and prevention

Know the symptoms: headache, dizziness, weakness, nausea, irritated eyes and confusion — they mimic seasickness and intoxication, which is why CO is missed so often. Prevention is routine: keep exhaust systems and outlets clear and unblocked, ventilate the cabin, never run engines or a generator while people swim at the stern or sleep below, and get anyone showing symptoms into fresh air immediately.

Pyrotechnic distress signals

Every vessel in U.S. navigable, coastal and territorial waters must carry Coast Guard–approved visual distress signals. The pyrotechnic family covers red flares, hand-held or aerial, for day and night; orange smoke, hand-held or floating, for day use; and launchers for parachute flares or aerial red meteors. Carry a minimum of six devices — three for day and three for night; some devices qualify for both. Every device carries a service life: never use an expired one, and store them cool and dry in a high-visibility watertight container. Flares burn with a searing flame that can cause burns and ignite flammables, and pistol-style launchers handle like firearms — some devices are banned in certain places, so check state and local regulations before you go.

Non-pyrotechnic signals

Two approved alternatives, both required to be Coast Guard–approved and kept readily accessible. The orange distress flag is for day use only: at least 3 by 3 feet, printed with a black square and a black ball on an orange field, displayed where it can be spotted — flown from a boat hook or long fishing rod, or fixed to a paddle and waved overhead. Electric distress lights are for night use only and flash the SOS signal in Morse code (…–––…). A plain white light flashing 50 to 70 times a minute is commonly treated as a distress signal under the inland rules, but on its own it does not meet the Coast Guard carriage requirement. Whatever you carry, never display a distress signal unless help is genuinely needed to prevent immediate danger to the people aboard.

Sound signals

Every boat must carry a sound-signaling device. The navigation rules call for sound signals in situations such as crossing and overtaking, and all vessels under 13 meters in length are required to carry a whistle, in inland and international waters alike.

The Mayday call — VHF channel 16

A VHF radio is your voice for distress calls, ship to ship and ship to shore — and channel 16 is the primary channel for ships in distress. To make the call:

1. Make sure the radio is on.
2. Tune it to channel 16.
3. Press and hold the transmit button.
4. Say clearly: “Mayday, Mayday, Mayday.”
5. Give your vessel's name, hull identification number and description; your position or location; the nature of the emergency; and the number of people on board.
6. Release the transmit button.
7. Wait ten seconds for a response.
8. If no one answers, repeat the call.

Life jacket rules

The law requires one Coast Guard–approved, wearable life jacket (PFD) aboard for every person, in good condition and readily accessible — reachable and wearable within a reasonable time in an emergency, never stored away in a locked or closed space. Before you leave the dock, show passengers where the jackets are and how they go on, and make sure each one fits its wearer: snug, without restricting breathing. Children under 13 must wear a Coast Guard–approved life jacket unless they are below deck or in an enclosed cabin, and some states set their own rules, so check local law before taking children out. A person being towed — a water skier or wake boarder — counts as being on board the vessel, so a PFD is required for them too, and it should be one built to stay on through the impact of hitting the water at speed.

The five PFD types

Type I — the offshore jacket. The most buoyant of the family, made for all waters including where rescue may be delayed, it will turn most unconscious wearers face-up in the water.

Type II — the near-shore buoyant vest, for calm waters where a quick rescue is likely. It turns some unconscious wearers face-up, but not as reliably as a Type I, and some models must be inflated.

Type III — the flotation aid for inland waters with a good chance of immediate rescue, and the usual choice for supervised activities like water skiing, wake boarding and kayaking. It helps the wearer hold a face-up position.

Type IV — the throwable. Ring buoys, buoyant cushions and horseshoe buoys are made to be thrown to someone in the water to hold onto until rescue — they are never worn. At least one Type IV is required on every vessel over 16 feet, on top of the wearable jackets.

Type V — the special-use device, such as a sailing vest or deck suit. It has to be inflated to be buoyant — inflated, it performs comparably to Types I, II and III — and it only counts toward the carriage requirement while it is actually being worn underway.

Caring for PFDs

A jacket only works if it's maintained, and every PFD has a life expectancy — replace it once it's past. Inspect for broken zippers, frayed webbing, water-soaked kapok bags, missing straps and stitching that has come undone. Wash jackets with soap and water and let them dry completely before storing. Squeeze a kapok-bagged jacket and listen: air escaping means the bag is defective and the jacket should be discarded. Grip the cover material and pull — if it rips, discard it. And if a kapok bag has gone hard, that jacket is done too.

Life rafts

Inflatable life rafts are recommended equipment for ocean-going vessels. Carry one large enough for everyone on board, stocked with proper emergency equipment, Coast Guard–approved, and serviced on schedule so it will actually deploy the day it's needed.

Fire extinguishers

Every recreational boat with a permanently installed fuel tank must carry Coast Guard–approved, marine-type fire extinguishers. Extinguishers are classified by a letter and a number: the letter names the kind of fire it's built for, the number its size. The Coast Guard–approved units are all type 5-B, marked on the label — and type B is the class for flammable-liquid fires: grease, oil and gasoline. An approved extinguisher comes with a marine mounting bracket so it stays put on the water; mount it somewhere readily accessible that won't hinder passengers underway, and check state and local law for anything extra your waters require. How many you need depends on the boat's length:

Diver-down flags

The red “diver down” flag means a diver is in the water below it. Fly it whenever a diver is operating from your boat, and keep watch for the diver's air bubbles. When you come across another boat's flag, give it room: stay at least 100 feet (about 30 m) away in inland water, and at least 300 feet (about 91 m) in open water.

Towing sports

Keep an extra watch around anyone in the water — divers, skiers, wake boarders and fishermen alike. Anyone being towed, skiing, wake boarding, wake surfing or tubing, wears a life jacket that will stay secure when they hit the water. Assign a passenger as a dedicated observer to watch the person on the tow line at all times — that job is never the operator's. Shut the engines off whenever someone is on the swim platform or transom climbing back aboard, and never tow after dark.

Fishing courtesy & the swim platform

Underway, stay clear of fishermen — nets and lines can be cut or wound into your propeller if you pass too close. Slow down as you approach fishing boats and don't come back up to cruising speed until you're past. When fishing yourself, never anchor in a shipping channel or tie up to a navigational aid, and use a tidal chart to help you avoid grounding. At the stern, inspect the swim platform's hardware and ladder fittings regularly and keep every connection tight; retract the ladder and lock it before making headway; in reverse, don't let water pile up on the platform or transom, especially in rough seas; and never exceed the platform's recommended maximum capacity. Above all: never operate the boat with people in the water on, on top of, or holding onto the swim platform — that is how serious injuries and deaths happen.

Mayday is French

The distress call comes from the French “(venez) m'aider” — “come help me.” It was standardized in the 1920s as the spoken twin of SOS, chosen because it survives bad radio static in any accent.

Starboard was the steering side

Before centerline rudders, ships were steered with an oar hung over the right side — the steorbord, or steer-board side, in Old English. The left side became “port” because that's the side you tied to the dock, keeping the steering oar clear of the pier.

Three sheets to the wind

The traditional story: sheets are the lines that control a sail's lower corners — not the sails themselves. Let them run loose and the sails flail and the ship staggers like a drunk. One sheet loose is sloppy; three is a lost cause.

The sea-state scale is a Douglas

The Douglas Sea Scale — the 0-to-9 scale in Swell Watch above — was devised by Captain H. P. Douglas of the Royal Navy in the 1920s and is still the World Meteorological Organization's official sea-state code. State 3, “Slight,” is a fine day out; State 9, “Phenomenal,” is 46 feet and up.

Red, Right, Returning

In the Americas (IALA Region B), when you're returning from sea — heading upriver, into harbor, or generally toward the head of navigation — red aids stay on your right. It flips in Europe, Africa and most of Asia, which is why the rule names its region.

Your running lights repeat the rule

A boat's red sidelight is on its port side and the green on starboard — the same pairing as the markers. Two boats meeting at night read each other's lights like a sentence: red-to-red means you're passing port to port.

A knot is a mile with a pedigree

One knot is one nautical mile per hour, and a nautical mile is one minute of latitude — 6,076 feet, a touch longer than the land mile. Navigators love it because a degree of latitude is exactly 60 nautical miles, so distances come straight off the chart's edge.

Hull speed is real math

A displacement hull piles up a wave it can't climb at about 1.34 × the square root of its waterline length in feet — a 36-foot waterline tops out near 8 knots no matter how much throttle you add. That's why trawlers sip fuel at 7 knots and gulp it at 8½.

The head is at the head

A boat's toilet is the “head” because sailors used the bow — the head of the ship — where the wind and the waves did the cleaning. The name stayed long after the plumbing moved indoors.

Galvanic corrosion is a battery you didn't build

Put two different metals in salt water — a bronze propeller on a stainless shaft, say — and you've built a battery that eats the less noble metal. That's the whole logic of sacrificial zincs: give the current something cheap and replaceable to eat. More in Tips & Tricks.

A fathom is an armful

Six feet of water depth, from the Old English fæthm — the span of outstretched arms, which is literally how sailors measured the lead line. Charts in the U.S. still sound in feet or fathoms depending on the coast, so check which unit your chart is speaking.

Groggy comes from grog

The traditional story, well documented: in 1740 Admiral Edward Vernon — nicknamed “Old Grog” for his grogram cloak — ordered the Royal Navy's rum ration diluted with water. The mixture was “grog,” and a sailor who'd had too much of it was, ever after, groggy.

Sixty-five feet, almost everywhere

Nearly every fixed bridge on the Atlantic ICW clears about 65 feet at mean high water — the number the whole waterway was built around. Miami's Julia Tuttle Causeway, at roughly 56 feet, is the famous exception that sends tall masts out into the Atlantic.

Pirates didn't make you walk it, mostly

Walking the plank is mostly a creation of novels and movies — the traditional-story label applies. Documented pirate punishments ran to marooning and keel-hauling; the plank owes its fame to fiction, which is a fine reason to keep it in the movies and off your boat.

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Red, Right, Returning — clockwise

The ICW is organized clockwise around the coastline. Southbound on the Atlantic side and westbound on the Gulf both count as “returning from seaward” — red to starboard, green to port. Head the other way and the relationship flips. Where the route weaves inland and changes direction, the yellow symbols keep you honest.

The right boat

Draft under about 5 feet and a mast under 64 feet runs nearly all of it comfortably. The Palm Beach–Fort Lauderdale stretch is the exception that takes more — keels to about 7 feet and taller masts, with fewer low bridges. Over 100 bridges cross the Atlantic ICW alone; most fixed spans clear 65 feet, and drawbridges open on schedule or on request.

Anchoring

Anchor outside the main channel, show an anchor light at night, and check the holding ground and tide swing before you settle in. Protected coves, rivers and creeks line the route, and marinas and public docks fill the gaps — but parts of Florida limit long-term anchoring, so check local rules first.

Pacing the trip

Most cruisers make 40–70 nautical miles a day: lines off at sunrise for the calm, secured by mid-afternoon with daylight to spare. At that pace Norfolk, Virginia to Key West is roughly three to four weeks of travel days — and plenty of boaters stretch the same run over months of harbor towns.

Tides & currents

The Atlantic ICW is tidal water: depth under the keel and clearance under the bridges both move with the tide, and shallow stretches can close to deep-draft boats at low water. On the Gulf side, wind often moves the water more than the tide does — especially in Louisiana and Texas, where levels shift with storms and seasons.

Sharing the road

Tugs, barges and workboats share the channel. Keep a proper lookout, work the VHF for bridge openings, and don't cut corners at markers — the shoaling lives just outside the channel. Power gives way to sail under the rules, but small boats shouldn't obstruct vessels that can only navigate inside the channel. And mind your wake: near docks, marinas and manatee country, it's seamanship, not just courtesy.