Hello, please add "GPS receivers" as a distinct hardware category. Commercial GPS receivers frequently go connected to the PC via an USB or serial cable. Special programs (such as gpsbabel, nutrak or the GPS module in kismet) are meant to collect data from them (position, gpx files, etc.). In order to do this, each GPS receiver must be supported (at first, it must be identified correctly by the kernel). Some GPSes are "seen" just as mass-storage units (if no data can be collected via the PC link, through an open protocol).