I am having this issue with my voter board and a Garmin GPS18x LVC.

The status page indicates a GPS lock, but the board keeps throwing this warning every 2 seconds or so.

I've loaded the SNSRXCFG.cfg and checked that the unit is in NMEA mode. 

The selected sentences are left as default although I did check and GPGSV, GPRMC and GPGGA are all selected as I read in another thread on here. 

What other NMEA settings do I need? NMEA 2.3 mode on?

Regards

Hayden VK7HH