Yes, put your name and a phone number on your boat and yes, you can use a Sharpie. In fact, it seems that you are required to have this info on your boat on some rivers. Besidess, you never know when you're going to flip, watch it float away, and then just hope someone gives you a call.
We are here on Earth to do good for others. What the others are here for, I don't know. W.H. Auden