The difference between a boat that's ready to go offshore and a boat that looks ready to go offshore can be invisible at the dock. The safety gear either has current certifications or it doesn't. The reefing system either works easily in the dark or it doesn't. The crew either knows the MAYDAY procedure or they're guessing under stress. A pre-departure checklist isn't bureaucracy — it's the systematic verification that the systems you're counting on will actually be there when you need them.
What follows is organized by category. Work through it in the week before departure, not the morning of. Many items require action that can't be completed at the last minute — the EPIRB battery that needs replacement, the life raft that's due for service, the engine raw water filter that needs cleaning. Discovering these on departure day doesn't postpone the departure; it just starts the passage with unresolved problems.
Safety Gear
EPIRB: Check the registration is current with your national authority (NOAA in the US). Check the battery replacement date on the label — most EPIRBs require battery replacement every five years. A non-registered or expired-battery EPIRB is a false confidence item at best. Activate it in self-test mode and verify the test light functions correctly. Mount it where it can be manually activated and where it will float free and self-activate if the boat sinks.
Life raft: Check the service date. Most offshore life rafts require inspection and repacking every one to three years depending on manufacturer and storage type. An overdue raft may still inflate — or it may not. This is not the item to defer. If the raft is out of date, get it serviced before the passage or rent one for the trip. Also verify that the hydrostatic release (if fitted) is in date; it allows the raft to float free automatically if the boat sinks while the raft is still aboard.
Flares: Visual distress signals have expiry dates. In US waters, USCG-approved flares are required to be current. Check every flare in your kit — parachute rockets, handheld reds, and orange smoke — and replace any that are within six months of expiry. Outdated flares may still fire, but they cannot be counted as your primary signaling equipment. Store them in a waterproof container accessible from the cockpit without going below.
Fire extinguishers: Verify all extinguishers are in date (pressure gauge in the green), accessible from the areas they protect, and known to every crew member. Galley, engine compartment, and navigation station are the three minimum locations on an offshore boat.
Jacklines and tethers: Rig jacklines from bow to stern on both sides before departure, not at sea. Inspect for chafe, UV degradation, and secure attachment points at each end. Every crew member needs a tether that fits their harness — try on all harnesses and tethers before the passage, not on the first night watch. Check the snap shackles: they should open under load, not just at slack. Any tether that's difficult to release under a load has a design problem you should know about before you need it.
Man overboard equipment: Life ring with drogue, whistle, and strobe attached should be deployed and retrieved before departure to verify everything is rigged correctly. The horseshoe buoy should be in its bracket and the release should work easily. Knowing where it is and how to deploy it takes five minutes and could be the five minutes that matters.
Navigation
Passage plan: A written passage plan should be filed with a shore contact before you leave. The shore contact needs to know your departure point, intended route and waypoints, expected arrival date, and — most importantly — what to do if they haven't heard from you by a specific date and time. This is your most important safety measure for a solo or doublehanded passage. A boat that's overdue and hasn't called in is when the shore contact calls the Coast Guard, not when it feels right.
Chartplotter and waypoints: Load all passage waypoints before departure and verify they're correct by comparing against your paper chart or cruising guide. A transposition error in coordinates can put a waypoint miles off the intended track. Check chartplotter software is current. Verify the chartplotter has adequate backup power or a separate backup device.
Paper charts: Carry paper charts covering the complete route including the approach and entrance to your destination. Electronics fail. A chart folio and a handheld GPS constitute a functional navigation system even with total electrical failure. For offshore passages, the relevant pilot charts and a current almanac are also worth carrying.
Weather: Download the latest GRIB files and Navtex forecast for your route before departure. Check NOAA Ocean Prediction Center charts for the passage area. Identify the weather window and verify it's still valid — weather windows erode and sometimes disappear in the 24 hours before departure. Know your abort criteria in advance: what conditions will cause you to turn back or divert?
Engine
Oil and coolant: Check engine oil level and condition. Change if due or near due — oil changes should not be deferred to mid-passage. Check coolant level in the header tank. Look for any evidence of oil in the coolant or coolant in the oil (milky oil or sweet-smelling coolant are symptoms of head gasket problems you don't want to discover 300 miles offshore).
Belts: Inspect the alternator and raw water pump belts for cracking, fraying, or glazing. A belt that looks marginal should be replaced before departure. Carry spare belts for every belt on the engine, and make sure at least one crew member can change them underway.
Raw water filter: Clean the raw water strainer before departure. A plugged strainer is the most common cause of overheating on passage. Check the raw water impeller — if you haven't replaced it in a season or are unsure, replace it now. Impellers fail without warning, usually at the worst possible moment. Carry two spares.
Fuel: Top off tanks the day before departure. Verify fuel is clean — use a fuel polishing run if the tanks have been sitting. For passages over 200 miles, calculate your fuel consumption for the expected motoring hours and carry a margin of at least 30% above that estimate in jerry cans or reserve tanks.
Water: Fill the main water tanks and verify the watermaker is operational. Run it for 30 minutes before departure to verify output quality and flow rate. Know your daily water consumption and carry at least two weeks of reserve beyond your expected passage duration.
Rigging
Standing rigging: Walk the standing rigging from deck level and with binoculars from the dock: look for broken strands at the swage terminals, which almost always fail there first, corrosion on turnbuckles, and any signs of cracks at the chainplates. If you have furling systems, unroll and inspect the luff of each sail for UV damage and the furling drum for smooth operation. Any questionable terminal should be replaced before departure, not after it fails at sea.
Running rigging: Run out each halyard and sheet to check for chafe — the common problem areas are where lines pass through blocks, clutches, and fairleads. Check the spinnaker or asymmetric halyard even if you don't plan to use it: you might need it as a spare. Inspect the mainsail outhaul and vang for proper operation. Flake halyards and sheets so they can run freely when needed.
Reefing system: Reef the main in the slip before departure. Not to check that it can be done, but to verify it can be done correctly in the dark by whoever will be doing it on watch. Single-line reefing systems have friction points and clutch sequences that need to be muscle memory, not mental work, at 0300 in a rising breeze. Every crew member who may need to reef should practice it before you leave.
Backstay and forestay: Verify tension and confirm the toggles at each end are aligned and showing no sign of wear. Check the backstay adjuster if fitted. A loose forestay on a close-hauled passage is uncomfortable and hard on the rig; a failed forestay is catastrophic.
Provisioning
Offshore provisioning follows a tiered logic: fresh food gets consumed first, semi-fresh food is the middle of the passage, and shelf-stable provisions are the contingency reserve.
Days 1–3, fresh: Meat, dairy, salad ingredients, fresh bread. Consumed before refrigeration becomes a question. Plan meals that require minimal galley work — the first days are often the roughest physically for the crew.
Days 4–14, semi-fresh: Eggs (unwashed or coated in vaseline last several weeks), hard cheeses, cured meats, root vegetables, onions, garlic, citrus. These keep without refrigeration and form the backbone of offshore provisioning.
Contingency, shelf-stable: Canned proteins and vegetables, pasta, rice, dried lentils, crackers, peanut butter, dried fruit, nuts. These are your safety net if the passage runs long, the weather diverts you, or something else extends the timeline. Calculate for at least twice your expected passage length.
Crew dietary restrictions: Address these before provisioning, not after you're three days out and someone discovers that half the meals contain an ingredient they can't eat. It's also worth knowing about allergies to medications — epinephrine injectors belong in the medical kit if anyone aboard has a serious allergy.
Seasickness medications: Distribute before departure, not after the first seasick crew member can no longer swallow pills. Scopolamine patches go on the night before or morning of departure. Antihistamine tablets go in every crew member's personal kit with instructions. Ginger products go in the galley within reach.
Crew Briefing
The pre-departure crew briefing is where the administrative preparation becomes operational. Assemble everyone before departure — including crew who know the boat well — and cover the following:
Watch schedule: Post the agreed watch schedule where everyone can see it. Confirm every crew member understands their watch times and their partner. Establish the handover protocol — the 15-minute briefing that covers traffic, weather, course, and systems.
Roles assigned: Who is the skipper (decision authority in any disagreement)? Who is responsible for navigation? Who handles medical? Who manages communications? These can overlap but they need to be explicit.
Radio check: Confirm DSC is programmed with the vessel's MMSI. Verify VHF radio works on all channels including Channel 16. Check SSB or satellite comms if fitted. Confirm everyone knows how to send a DSC distress call.
MAYDAY procedure: Walk through the MAYDAY call format — MAYDAY MAYDAY MAYDAY, vessel name, position, nature of distress, crew aboard, vessel description, OVER — until every crew member can recite it. Not read it from a card. Recite it. Post it at the chart table anyway, but recitation matters because cards get dropped.
Abandon-ship drill: This doesn't need to be elaborate but it needs to happen. Walk through where the grab bag is, what goes in it if time allows, how the life raft deploys, where the tethers and harnesses are. Everyone puts on their harness. Everyone confirms they can operate the EPIRB. Five minutes, every passage, with every crew.