I'm sure if Mr. sboardcrazy can afford a yacht...he can afford a decent GPS

, and I'm not insinuating that he need buy an expensive one, just that a GT-31 is not the most practical GPS.
My Furuno is great for plotting, creating & going to waypoints and most importantly - identifies dangerous reefs & obstacles. Combined with a depth-sounder, I can set a depth alarm for travelling over shallows & reefs.
A GPS is a crucial part of your safety equipment if heading offshore cruising. Getting hold of a good one can also add a lot of enjoyment and open up interesting locations to you with the right map info.