new boater...bought Chaparral 215ssi in November and can't wait to get out for the first time. I'd like to better understand how to read the charts, especially for Chesapeake Bay. Does anybody know of an on-line course, or a good reference book that I can study? I've got a GPS, but I don't want to be the dunce of the Bay, and in general, I like to be as educated as possible. Thanks.