Two identical boats sit side by side at a brokerage. One has a binder: every oil change with engine hours, the impeller dates, the survey, the receipts. The other has an owner who says the maintenance was "always done". The binder boat sells faster and for more - brokers see it every week. A maintenance log is not paperwork for its own sake; it is deferred money, claim insurance, and the difference between fixing a $200 problem and a $4,000 one. Here is what to track and the least painful way to track it.
- Log four things: services performed (with engine hours), items that expire, documents, and costs.
- Engine-hour-based service intervals are the core: oil, impellers, anodes, and belts fail by hours run, not calendar.
- Expiry items - flares, extinguishers, EPIRB battery, registration, insurance - carry fines or claim-denial consequences when missed.
- A documented boat is worth real money at resale: history reports sell for $20-45 because buyers pay for certainty.
- The log only works if it reminds you: a system that emails before an expiry beats a binder that waits to be opened.
#The four things worth tracking
#1. Services, stamped with engine hours
Every oil change, impeller, anode set, belt, filter, bottom job, and repair - with the date, the engine hours, what was done, and who did it. The engine hours matter more than the date: a 100-hour oil interval means nothing if you do not know the hours at the last change. This record is also the early-warning system: anodes eaten in half the usual time or an impeller that failed early are the cheap symptoms of expensive causes.
#2. Things that expire
Flares (42 months from manufacture in the US), fire extinguishers, EPIRB and life-raft batteries, registration, documentation renewal, insurance. Expired flares are a fine at a boarding; an expired extinguisher or unmet policy requirement can surface exactly when a claim depends on it. These are date-certain events - the only failure mode is forgetting.
#3. Documents
Title or documentation, registration, insurance policy, survey, engine serial numbers, warranties, big receipts. When the boat sells, the buyer wants them; when a claim happens, the adjuster wants them; when a storm approaches, you want them off the boat. Scans in one reachable place beat originals in the nav desk that just took water.
#4. What it all cost
Owners who log costs discover their real number - usually 2-3x what they guessed - and that number drives better decisions: which jobs to bundle at haul-out, when repair stops beating replacement, and what to budget next season. Our marina cost guide covers the dockage side; the maintenance log covers the rest.
#Paper, spreadsheet, or app
The binder works until it stays ashore, gets wet, or the one person who understands it sells the boat. The spreadsheet works until nobody opens it - and neither one ever reminds you of anything. The digital version earns its place with three things: reminders that arrive by themselves, documents attached to the records they belong to, and a clean export when it is time to sell. Boat Vault in the Marine OS route planner (part of Boater Pro) is built exactly on that pattern: a service log with engine hours, expiry reminders that email at 30 days, 7 days, and on the date, a document wallet, and a printable boat report - the binder, generated on demand for a buyer, surveyor, or adjuster.
Do not try to reconstruct ten years of history. Enter today's engine hours, the last oil change you are sure of, and every expiry date aboard - flares, extinguishers, EPIRB, registration, insurance. That is the whole safety-critical core, it takes ten minutes, and the log grows correctly from there.
Service log, expiry reminders, and a printable boat report
Boat Vault keeps the service history with engine hours, emails you before anything expires, holds the documents, and prints the maintained-boat report buyers pay premiums for. Part of Boater Pro.
#Frequently asked questions
Frequently asked questions
Hours, expiries, documents, costs - ten minutes to start, real money at the end. Pair it with the hurricane prep checklist for the season's risk side, and the HIN lookup guide when you are the buyer checking someone else's story.
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