I have a Garmin GPS V, the best of the classic Garmins. Have kept it for a while, took it to Africa in case I got lost on Safari, and to Scotland last year when stalking, but last really used it in the summer on my boat for clocking its speed and that of my jetski!!
Now got a proper boat gps/sounder so don't really need it any longer. Would make a good addition to a survival bag on a small SIB/RIB, or just a spare on a bigger boat. They currently seem to be about £80 on eBay. I am looking for £45 including box, belt/protective case, Dashboard bracket, PC cable, and mapsource software and postage. Would do it for £40 collected from Littlehampton in West Sussex.
Internet picture of identical unit below: