Used Boat Inspection Checklist (Buyer's Edition)

A used boat inspection isn't a survey — but a tight buyer-side checklist will catch about 80% of the issues that turn into post-purchase regrets. Use this before you put down a deposit.

Pre-walk-through (before you visit the boat)

• Confirm hull ID number (HIN) matches title and registration
• Run a NICB / state title check for theft and liens
• Verify engine hours from documented service records, not just the gauge
• Check the boat's coverage history — see used boat warranty options

Hull and structure

• Walk every inch of the deck for soft spots
• Look for stress cracks at hardware mounting points
• Inspect the transom for moisture, especially around outboard bolts
• Check stringers and bulkheads for delamination
• Look at the bottom for blistering, repaired strikes, or fresh paint hiding damage

Engines (the most expensive thing to get wrong)

• Compression test every cylinder — out-of-spec cylinders mean a powerhead problem
• Pull the lower-unit drain plug and check for milky oil (water intrusion)
• Inspect the spark plugs for fouling
• Verify ECU error codes with a marine diagnostic scan
• Match the documented hours to wear patterns (wheel, helm, throttle, seat)
• Sea-trial under load — full RPM, hard turns, idle quality

For real cost expectations on engine repairs, see our outboard repair cost guide.

Electrical and electronics

• Confirm all displays power on, including radar and autopilot
• Check battery age and condition
• Look for dock-cord damage and signs of voltage spike (burnt smell, melted plastic)
• Inspect every terminal you can access for corrosion

Generator and AC (if equipped)

• Run the generator under load for 30+ minutes
• Confirm AC cools to spec in every zone
• Check the genset hour meter against service records
• Inspect raw-water cooling and exhaust elbow

Paperwork and warranty

• Confirm the seller has clear title in hand
• Get a written maintenance history, not just verbal
• Ask if the boat has any active or transferable warranty
• Plan to get a warranty quote before closing — coverage is significantly cheaper before an issue surfaces

When to walk away

• Compression out of spec on any engine
• Soft deck or transom moisture
• Service records that don't match the hour meter
• Title issues, liens, or unresolved incident history

Related reading

• 7 red flags to avoid
• Used boat warranty
• Engine reliability guides