USCG Documentation renewal
I had the boat documented with the US Coast Guard as part of the requirements from the bank. They ask that you renew your registration every year, so that they can be sure that nothing changed about the boat, and that you still own it. This is a free service. They do not charge you for this. Infact, its one tiny form to fill out. If your address doesn't change, all you do is sign it, write "owner" and put the date on it. Then fold it, tape it, put a stamp on it, and go sailing.
Optionally, you can use Specialized Yacht Services awesome renewal service. This is a private company which will take all the hassle out of signing your name, writing "owner" and applying those cumbersome stamps for a one time (a year) low, low fee of $75!
For this very low $75, you get to sign your name, write "owner", put the date on a form, write a check (including another date, another signature, write the number twice, and tearing it out of the book) and put it into a provided envelope. Granted... you don't have to affix one of those stamp things... nor deal with tape... but you do have to lick the glue.
Act now, and they will sign you up to receive other awesome free offers via the USPS, and email.
Seriously... $75 fee to fill out twice as much info, but save $0.41 on a stamp.