I guess this is kind of a goofy question, but there it goes. Can I take my 1975 18' Mark Twain 165 hp I/O around the Galveston TX area? And if so, what can I do to prep my boat for a saltwater outing? Its too far from Dallas to go and take a look, so if possible I would like to know ahead of time. Are there certain types of maps I should look into getting, should I get a GPS device, will I need to do anything to the motor before and/or after?