Re: Car GPS On boat
I would think if you're familiar with the waters, the Nuvi will help keep your orientation (that's basically the way I use it ... "Oh yeah, the dock is THAT way!"). When you start looking at venturing out in places you don't know I would (especially on the ocean) think that a device designed to work in that environment would be better. I've run once on the Pacific off shore without anything, but it was just off San Diego Bay and it was easy to find my way without. Had I not asked questions though, I would have run smack into an area that I was told to avoid (I can't remember exactly what for, but it had something to do with depth vs. the swells the water took at that point) and a Nuvi wouldn't have given me any warning. That's the kind of thing I would think the actual marine GPS units would be helpful with.
I hope I get to come down and test your waters out someday. We've got some acquaintances down in Puerto Rico and have a standing invitation to visit.
Enjoy the ocean!