I have been trying to find a USB GPS receiver with connector for external antenna. No success.
The reason for this is that I've got a GPS antenna on my car roof in a sharkfin.
On ebay I found a BMW part but it is not USB, and if it is NMEA it is probably thunneled in BMW protocol IBus.
BMW-TRIMBLE-GPS-RECEIVER
system overview
Pointers appreciated!
B-O