"Marinized"
I've seen specially treated laptops that have been "marinized". My understanding is that it means they stablized the interior workings so harsh jolts (not being thrown across the cabin!) won't disrupt it as easily, and that it can withstand saltwater better. BUT you're paying close to a grand more for that special treatment. In my way of thinking, I'd buy a not-the-top-of-the-line model for my boat, knowing that in the 3-4 years it takes to destroy it, it'd be time for a newer model anyway! If you do get one, either keep it away from that companionway or find/make some special protective watertight cover/bag so it's less likely to get wet.BTW, paper charts are cheaper! ;-)LaDonna