See GPS for details on how to evaluate the Freerunner GPS with command line utilities.
MicroSD Card Issue
Information about faulty antennas
- If you removing the SD card doesn't help and you suspect your antenna, try unplugging and replugging the internal GPS connector. (See Disassembling_Neo1973 about 2/3 of the way down. (this may differ on freerunner, pictures appreciated)
Also note that there is a trac ticket for this issue: #1542
FreeRunner_GPS_antenna_repair_SOP Indicates that some (rare?) units may have bad soldering, and includes a guide to fix. This will presumably void your warranty.