If there is anything I would want "on board" is the proper owner registration papers, be they state titled or documented boat.
USCG informed me the potential fine is $10,000.00 a day, each and every day
you are operating the boat without it.
( Some years ago, I was in a hurry to get documentation papers back and asked if it was ok to just go without them, since the coasties already acknowledged they had my forms in their possession.) When the laughter ceased,
I got a two letter answer, emphatically "NO" followed by the above information relating to the cost of getting caught.