Last week I presented some slides on using a Garmin GPS. It is geared towards non-techie hillwalkers, but it has a few pointers to OSM, not the least of which is "how to put an OSM map on your Garmin".

The slides are at http://megarezo.org/~moltonel/Tyndall%20GPS%20course.pdf for anyone interested. I can make the original odp file available on request, and put an explicit PD/CC licence on the file if necessary.

Enjoy.