Selecting a surveyor
Picking a "good" surveyor is difficult. You are right to think about credentials, references, etc, but that is only the beginning. It's possible to get an inadequate survey from a very credentialed surveyor -- and the reverse, too. I tend to think that references from people you trust is the most important starting out point. From there, talk to the surveyor you would like to hire to find out his level of experience with the type and model boat you want to buy, to include how it's equipped. Has he done surveys on this model before? Can you read some samples? Finally, discuss in detail just what you want from the survey. A qualified surveyor ought to be able to tell you a lot about all the major systems and equipment on your intended boat, but do not expect him to know everything. Perhaps the most important things are for you to pre-survey the boat yourself first to get an idea of the questions you should be asking when you join this surveyor as he surveys your boat. You must be there when the survey to be done or you may be wasting your money. Good luck.