I actually have a Palm branded gps (bought the Palm GPS Tom Tom thing). Most of the bluetooth GPS units will work with each other--they trasnmit standard codes. My Palm unit works with Microsoft Streets, Google Maps and Windows Live along with Tom Tom. However, I think most of them will do the same thing. If you do buy a bluetooth GPS, get one with the new SiRF III chip (fairly common now) as it will work WAY better under more conditions.