The primary consideration when inspecting any vessel, new or used, is to make sure it complies with building standards and safety requirements. Surveys vary with the type of survey requested, based on the ship's size, equipment and onboard systems.
There may be additional services required, such as engine surveys, oil analysis, galvanic and stray-current corrosion, ultrasonic and moisture testing, as well as other nondestructive tests. Well-conducted surveys provide information on the vessel's condition and value, but do not offer guarantees. You will see a sentence like this at the bottom of every completed survey: "This Report of Survey relates the condition of accessible areas only as they existed at time of inspection."