Marine AI Copilot™A boat maintenance schedule you will actually keep
Most boats have a maintenance schedule somewhere: a page in the engine manual, a spreadsheet from the previous owner, a list in a drawer at the marina. The ones that get used share three habits. They run on two clocks, they say what each service needs, and they are updated where the work happens.
Two clocks, not one
A car's service schedule runs on miles. A boat's runs on two things at once: the calendar and the engine hours. Impellers, zincs, belts and hoses age whether the boat moves or not, so they are due by date. Oil, filters and valve adjustments wear with running, so they are due by hours. Most engine makers give both, with the rule that whichever comes first wins.
A schedule that tracks only one clock misses half the work. The oil that was changed last spring is fine by the calendar and overdue by hours after a long season; the impeller that saw forty hours is fine by hours and overdue by date after three years. Write both intervals down, and record both the date and the hour reading every time the job is done.
Where the intervals come from
From the maker's manuals, and nowhere else. The engine manual, the generator manual, the outdrive or transmission manual, the watermaker, the windlass: each has a service table, and each table is written for that model by the people who built it. A schedule that copies intervals from a forum, a friend's boat or an app that guesses is a schedule that will be wrong for yours in ways you will not find out about until something fails.
The manuals also settle a second question: what the job needs. Oil capacity and grade, filter part numbers, the impeller kit, the belt size, the zinc part. Write those beside the interval. A schedule that says "oil and filter, 100 hours" is a reminder. One that says "oil and filter, 100 hours, 12 quarts 15W-40, two of filter part such-and-such" is a job you can do on Saturday.
What goes on it
Everything with a service interval, which is more than the engines. A reasonable first pass for a cruising boat, with every interval taken from your own manuals:
- Main engines: oil and filter, fuel filters, raw-water impeller, belts, coolant, zincs, valve clearance, heat exchanger.
- Generator: the same list on its own clock, which runs far more hours than the mains on a boat that anchors out.
- Drivetrain: transmission or outdrive fluid, shaft seal, cutless bearing, propeller inspection.
- Steering and controls: hydraulic fluid, cable inspection, autopilot drive.
- Systems: watermaker membranes and filters, water heater anode, head joker valves, bilge pump tests, air conditioning raw-water strainers.
- Safety gear by date: flares, fire extinguishers, life raft service, EPIRB battery, inflatable PFD cylinders.
- Tender and outboard: their own oil, impeller, gear lube and zincs, usually forgotten until the tender will not start.
A schedule is a table with four columns
Whatever you keep it in, the schedule needs the same four things for every job: the equipment, the procedure, when it was last done (date and hours), and how often (date and hours). Everything else is derived. Next due is last done plus the interval; overdue is next due in the past; what to buy is the parts of every job coming due that are not already aboard.
| Equipment | Procedure | Last done | Every |
|---|---|---|---|
| Port main engine | Oil and filter service | Apr 12, 1,620 h | as the manual says, by hours and by months |
| Generator | Raw-water impeller | Mar 3, 2,980 h | as the manual says |
| Life raft | Service and repack | Jun 2024 | per the maker, by date |
Three rows are enough to see why spreadsheets fail at this. The hour column has to be updated from the engine room, the "last done" column has to be updated with greasy hands, and the parts have to be checked against the locker before the chandlery closes. A schedule that lives on a laptop at home is a schedule that is a season out of date.
Keeping it current
Three habits keep a schedule true:
- Record the hours when you shut down, or periodically on long passages. Every meter, every trip. It takes a minute and it is the only way the hours clock means anything.
- Mark the job done where you do it. Date, hours, and what was used, before the tools are put away. The schedule moves the next due date itself.
- Draw down the spares. If the service used two filters, the locker has two fewer. The next shopping list is only right if the count is.
How Marine AI Copilot does this
The DIY Maintenance tile holds the schedule on your phone. Each task is a procedure scheduled against the equipment it serves, with the intervals you take from your manuals, by date and by hours; the app never supplies an interval of its own. Engine hours are read from a photo of the meter or typed in. Each procedure lists what it uses, so completing a task draws the ship's inventory down and the shopping list shows what the next services need that is not aboard. Reminders arrive as notifications or as events on your own calendar, and with more than one boat on the phone the fleet schedule lists every boat's tasks in one place.
The schedule, the procedures, the log books and the inventory work without a subscription when entered by hand. Reading a meter or a locker from a photo, and writing a procedure from a description of the equipment, are Premium features with a free first week.
Nothing here replaces the manufacturer's manuals, intervals or procedures for your equipment. Take every interval and every part from the manual for your model.