I have 2 Seekers. To the best of my knowledge I have not changed anything besides setting the QGCIP to NULL and starting the rtsp server for the high res camera on boot.

One seeker will go into POSCTL mode. The other, when selecting POSCTL, the light on the gps will blink red and it will remain in manual mode. There does not appear to be any error messages. How can I troubleshoot this?