might be an insurance survey. they are much less detailed than a purchase survey. they verify the boat isn't sinking or about to blow up and is still in the possession of the owner.
i had a survey offered to me on a boat i was looking at. the survey was about useless
insurance surveys don't usually require a haulout so there is no inspection of the hull at all
purchase survey costs about 3 or 4 times what an insurance survey would IIRC