Boat condition and boat value estimation. Damage assessment. Accident investigation. These are just a few of the many services that fall under the broad definition of marine survey. In its simplest terms, marine survey can be described as any fact-finding endeavor having to do with boats. When a boat owner needs insurance, a boat appraisal is needed to determine the boats condition and value. When a boat or its cargo is damaged, a marine surveyor evaluates the extent of the loss and its cause. In essence, a marine surveyor is a trained professional who acts as your eyes and ears in any assessment or investigation situation - someone who makes sure accurate information is gathered correctly and impartially.