Can't speak for the online side of things, but it's possible to use most Garmin watches fully offline. I'm not talking about a reduced functionality style offl

Can't speak for the online side of things, but it's possible to use most Garmin watches fully offline. I'm not talking about a reduced functionality style offline mode either; the watch computes all metrics locally, you can load OSM for navigation, copy MP3 files to it and copy GPX traces off of it.