A Sea Trial Is Not A Boat Ride
The purpose of a sea trial is to check the boat's systems, engines, generators, electronics, and other parts that cannot be inspected while the boat is not under commission or is "on the hard." The surveyor will need to pay close attention to the engines, helm, and systems, and how the boat handles.
To get the most from a sea trial, leave the kids, dog, and Aunt Kate at home. They can get a ride on the boat later, assuming you buy it. Too many folks on the boat makes it difficult for the surveyor to do the job properly.
Surveyors Are Happy To Talk Things Over With You
Most surveyors will be only too happy to talk to you about the survey process, especially if this is your first time employing a surveyor. They will also answer questions after the survey, so don't be scared to call them up if you see something in a survey report that you don't understand. Surveyors are on boats every day, but owners and buyers may not always understand some of the technical terms.
Remember surveyors often get concerned when a client asks for a cheap survey because "it's only for insurance." Most surveyors are professionals and want you to be happy with your boat and ensure your safety on the water. In return, you want him or her to spot any deficiencies with the boat. Surveyors need to be able to stand behind their work (possibly even in the courtroom), and doing a "light" survey doesn't help anyone.