the author of this app says:
GlobeTrack is a GPS application that, when connected to a GPS device, can retrieve GPS data and send it to your desktop computer through the GlobeTrack data server.
You will need a GPS device, a RIM device with wireless service and a null modem adapter or connector. You can find out more by visiting the GlobeTrack home page.
The software and service is provided to the public by GlobeTrack, free of charge.
GlobeTrack is compatible with RIM 950 and RIM 957.