A marine survey is a careful, systematic inspection of a vessel’s condition and systems. There are several types of surveys, each with different scopes, reporting criteria and purposes. The most commonly requested is the prepurchase survey, which helps a prospective buyer understand the boat’s overall condition, identify safety and reliability issues, and evaluate maintenance or repair needs prior to completing a purchase.
The prepurchase survey aims to provide a thorough assessment of the boat without major disassembly. A qualified marine surveyor visually inspects structural elements, machinery, electrical and plumbing systems, and safety equipment. The survey also includes operational checks of major systems to confirm they function under normal conditions. The resulting report documents deficiencies, observations, and recommendations that can affect safety, insurance, financing, and long‑term ownership costs.
The prepurchase survey is generally conducted in three distinct stages:
- In‑water inspection: The vessel is inspected afloat with all systems commissioned and operable. The surveyor examines topside structures, deck hardware, through‑hull fittings, visible hull condition where accessible, and interior spaces for signs of moisture, rot or structural issues.
- Haulout: When the boat is hauled and supported ashore, the surveyor inspects the hull below the waterline, propulsion components, rudders, shafts, propellers, zinc anodes and hull‑to‑through‑hull fittings. Haulout allows a closer examination of areas that cannot be accessed while the vessel is afloat.
- Sea trial: The boat is operated under load in conditions that approximate intended use. During the sea trial the surveyor evaluates engine performance, steering and handling, vibration, electrical charging systems, fuel delivery and other operational characteristics.
A surveyor’s report focuses on defects and conditions that impact safety and reliability. Examples range from loose deck cleats and worn rigging to improper fuel or electrical fittings. Even small items can become major problems: a loose cleat can let water into a deck core and cause extensive core damage, and incompatible metals on fuel fittings and aluminum tanks can accelerate galvanic corrosion. Both scenarios affect safety and may influence insurance coverage or financing decisions.
The written survey report is the record of the surveyor’s findings and professional opinion. It typically lists equipment and serial numbers where available, documents observed deficiencies with photographs, and provides recommendations for repairs or further evaluation. The report is intended to inform the client about the vessel’s condition rather than to explicitly advise whether to buy the boat. Lenders and insurers commonly request a copy of the prepurchase survey as part of their underwriting process; sellers may also request portions of the report to address concerns before a sale is finalized.
To help the survey proceed efficiently and produce a useful report, consider these practical steps when scheduling an inspection:
- Arrange for the vessel to be hauled and pressure washed, and confirm the date, time and location with the boatyard and the surveyor. Brokers often assist with scheduling.
- Have the vessel’s documentation, registration and any equipment manuals available for review.
- Remove items not included in the sale or clearly mark them as excluded, and clear nonessential personal items from lockers and compartments so the surveyor can access spaces fully.
- Unlock compartments and provide clear access to machinery spaces, bilges and storage areas.
- Give the surveyor a written list of specific questions or concerns so they can be addressed during the inspection.
Many surveyors prefer that clients remain nearby during the inspection but not interfere with the process. Surveyors will point out significant issues as they encounter them; excessive interaction can be distracting and may reduce the thoroughness of the examination. After the physical inspection is complete, the surveyor spends additional time compiling notes, photographs and observations into a clear, well‑organized report. Report styles vary, so ask to review sample reports before hiring a surveyor to ensure the presentation meets your expectations.
Beyond a standard prepurchase survey, many surveyors offer additional services—such as insurance surveys, condition and valuation surveys, or specialized inspections for older materials or complex systems. Discuss your specific needs and concerns with prospective surveyors to make sure you choose someone with the appropriate experience and qualifications.
This article originally appeared in the July 2011 issue.