In this PopSci "Void Your Warranty" piece, MAKE contributing writer Dave Prochnow shows you how to use an old OnStar GPS unit on a laptop computer with free software, no subscription required.
Raising GPS from the Dead - Link
Related:
- OnStar Projects - Link
- OnStar eavesdropping - Link
http://blog.makezine.com/archive/2007/09/raising_an_old_onstar_gps.html