I have a feeling you are not in North America.....
I have a feeling you are not in North America, which will make guessing from here difficult.
If you were here, I'd say look at the title, b/c if you can't see a title, you aren't going to touch the boat. I assume you have an interest in it, not idle curiousity.
I also see registration numbers which may be the starting place--find the agency where you are that registers boats.