Every time I hear something about boat surveyors I bust out in laughter.
It's an unregulated industry that requires no training what so ever. Even an accredited S.A.M.S. yacht surveyor requires no education at all.
All you need to become an accredited boat surveyor is 3 years of experience running the till or scraping boat bottoms in a marina and complete a simple test. You only need to write the test to be accredited, it's not mandatory.
Or, one day, just decide that you want to survey boats for a living and "You is a boat surveyor guy", crazy isn't it. There is no regulation.
The banks and insurance companies have swallowed this scam up, hook, line
Unless your spending some big dollars and need insurance, some common sense with a little experience will do just as well as a surveyor who knows nothing.
Besides it's "your" money that's buying the boat not the surveyors money and as a result you will have more interest in things. Take lots of pictures and if possible visit the boat a couple of times prior to purchase as you always miss something the first time and take notes. Do the visits alone if you can as you will have less distractions.