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Sea Trial

A real-world operational test of a vessel under way, used to verify performance, handling, and system operation.

A sea trial is an on-water operational test of a vessel, typically conducted as part of a pre-purchase survey, after major engine work, or as acceptance testing for a new build. The vessel is taken out under real operating conditions and run through a series of checks: engine RPM at various loads, steering response, vibration, electronics functionality, fuel burn, and handling at speed.

Pre-purchase sea trials are usually 1-2 hours with the surveyor, buyer, and seller aboard. The surveyor records observed values, notes any anomalies, and issues a sea-trial report separately from the main condition survey. On new-build acceptance trials, the yard runs a longer protocol to verify contract specifications.

A failed sea trial — often due to engine or drivetrain issues — is a common reason for renegotiation or cancellation of a yacht purchase.

Examples

  • A 2-hour sea trial run in Biscayne Bay during a pre-purchase survey on a 60-foot yacht.
  • An acceptance sea trial for a new-build sportfish tests top speed, cruise efficiency, and autopilot integration.

Related Terms

Marine Survey—A professional inspection of a vessel's hull, systems, and equipment performed by a qualified marine surveyor.Displacement—The weight of water a vessel displaces when floating, equal to the total weight of the vessel and its contents.Hull Insurance—Marine insurance covering physical damage to or total loss of the vessel itself.

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