I am interested in buying a GPS receiver. The problem is that none of them use Mac-compatible software (not to mention they all connect using serial cables, but that's another issue). I'm aware of one program for the Mac (GPSy) that enables one to use most GPS receivers with a Mac, but it's relatively expensive. The better plan seemed to be to buy Virtual PC and try to connect to the GPS with a USB adaptor. Does anyone have experience with the Mac and GPS units in general, and with running them through Virtual PC specifically?