Having this geo-community service on the mainland would be great too!
We have been doing this for a few years with all our old (and new) GPS units. We also bought a couple that were a good deal on EBay to add to the loaner drawer. We have sent them as far as Ontario last Spring Break for a kids' camp. I load them with maps (on trial
) and send them off for adventures. We loan them to tourist for a little cache outing, as well as locals as you've suggested who want to try it out before taking the plunge.
We also have 4 link cables that we loan out - it's amazing how many people leave them at home and then can't load their GPS once they get here.
Having stuff for Delorme's comes in handy too.
Ours have been out with local families, middle schools, Scouts, Guides, tourists, seniors, and all sorts in between. One actually went on a date! If locals do decided they want to buy one, we send them to Valhalla here on the island because last time I checked with the owner they matched the online stores prices.
If you're on the island and you want to donate an old GPS to a good cause, please let us know and we'd be happy to help them have a bit of a reincarnation. Heck, we'll trade you for some coins if you want!