Boat Maintenance Checklist for Cruisers and Liveaboards

Most boat owners have a mental list of what needs doing. Engine oil every 100 hours. Impeller at the start of the season. Antifoul in the spring. It works — until it doesn't. Until you're three weeks into a passage and you can't remember if you changed the raw water impeller before you left.

This is a practical boat maintenance checklist for independent boat owners, cruisers and liveaboards. Not a manufacturer's manual. Not a survey requirement. A real working list you can adapt to your own boat and actually use.

Engine and mechanical

The engine is where most boat owners spend the most maintenance time — and where most problems go undetected longest.

• Engine oil and filter — typically every 100 engine hours or annually, whichever comes first
• Raw water impeller — annually before the sailing season, or every 200–300 hours
• Fuel filters (primary and secondary) — annually, or sooner if you suspect contaminated fuel
• Coolant level and antifreeze ratio — check before winter layup
• Drive belts — inspect annually for cracking or wear; replace every 2–3 years
• Zincs on saildrive or shaft — inspect every 3–6 months depending on water
• Gearbox oil — check level monthly; change per manufacturer interval (typically 2 years)
• Throttle and gear cables — inspect annually for stiffness or fraying

Hull and deck

Hull maintenance is mostly about water ingress and osmosis prevention. Catching problems early is far cheaper than repairing them later.

• Antifoul paint — annually for most cruising sailors; more frequent in tropical waters
• Hull osmosis inspection — every 3–5 years, more often on GRP vessels over 20 years old
• Keel bolts — inspect at every haulout; re-torque if any movement is suspected
• Deck fittings and stanchion bases — check for leaks and cracks annually
• Teak deck seams — re-caulk when seams start to crack or lift
• Through-hulls and seacocks — operate all seacocks at least twice a year; grease annually

Rigging and sails (sailing vessels)

Standing and running rigging failures at sea are serious. A conservative replacement schedule is cheaper than an emergency.

• Standing rigging — inspect annually; replace every 10 years or after any significant impact event
• Chainplates — inspect every 5 years; remove and check for corrosion under the deck
• Running rigging — inspect annually; replace halyards and sheets every 5–8 years depending on use
• Furling systems — lubricate annually; check foil sections for cracks
• Mast boot and deck seal — inspect each season for water ingress
• Sails — annual inspection by a sailmaker for UV damage and seam wear

Electrical and electronics

• Battery bank capacity test — annually; replace when capacity drops below 80%
• Battery terminals — clean and grease annually
• Shore power cable and plugs — inspect for damage before each use
• Navigation lights — test all lights at the start of each season; carry spare bulbs
• VHF DSC registration — ensure MMSI is registered and battery backup is functional
• Bilge pump float switch — test monthly
• Wiring connections in the bilge — inspect for corrosion annually

Safety gear

Safety gear has expiry dates. Most boat owners only discover this at a port inspection or when they need to use it.

• Flares — valid for 3 years from manufacture date; check current regulations for minimum carriage
• Fire extinguishers — annual inspection; replace or service every 5 years (or per manufacturer)
• Life raft — service every 1–3 years depending on manufacturer and storage conditions
• EPIRB — check registration, battery and hydrostatic release annually; battery replacement per label
• Lifejackets — annual service including bladder test and re-arming kit check
• Harnesses and tethers — inspect stitching and clips annually; replace every 10 years
• First aid kit — check contents and expiry dates annually

Seasonal tasks

Start of season

• Engine service (oil, impeller, filters)
• Antifoul application (if hauled)
• Check all safety gear expiry dates
• Test navigation lights, bilge pumps and alarms
• Inspect standing rigging and sails
• Check all flares are in date

End of season

• Flush and winterize the engine cooling system
• Drain all water systems if laying up in freezing conditions
• Service winches
• Remove and store sails
• Check battery charge and disconnect shore power
• Log any outstanding maintenance for next season

How to actually keep up with it

The challenge with boat maintenance isn't knowing what to do — it's keeping track of when you last did it and when it's due next. A paper log works, but it doesn't remind you. A spreadsheet works, but it's easy to forget to update.

The most reliable approach is to keep your maintenance log in a system that tracks intervals and tells you when things are coming due — so you can focus on sailing, not administration.