Does the boat "look" abandoned?
The reason I ask is that I have had marinas
tell me that the information is private and they won't supply it - fair enough.
Another person told me to have some "plastic" business cards made up stating something like, "I am a private party and am interested in buying
your boat. If you are interested in discussing a sale
, contact me at XXXX, XXXX, XXXX"
Then stick these on boats. If the owner comes by at all he may see it and may be prompted to discuss.
You can also give these to the marina operator and ask them to give it to the owner or stick it in with the owners monthly bill...