Re: Rino 120 GPS
Don't know much about the Rino, though it looks like a good idea.  I have the eTrex, very basic GPS only, and just love it for getting to dive locations and then back to a ramp you might have been at only once.  We even marked the location of our stranded boat once when we had to bush-whack out, hitch a ride, take a ferry,... then came back under the moonlight to rescue the boat.  That was an adventure.   GPS is a great thing.  Isn't VHF a better bet for boaters than FRS though?  VHF has much wider range, is monitored by rescue services, and is widely used by commercial operators.