Beware of outfits out there (at least in the U.S.) who will email
or mail you a form warning that your boat registration
is due for renewal. Before doing anything else, check your current registration
document to see when it will lapse. I made the mistake of not doing so and renewed my registration online. After receiving the new registration document I noticed from my old one that it was still valid for another 2 months! I then contacted the company supplying the new document to have them change the dates but was told "so sorry Charlie" no can do. Result was I lost
2 months of the cost of my original registration. I was conned.