I have the Gmm-g3 module with the AXN_5.1.1_3333_17081700,8538 firmware. For some reason the module prefers to use a GAGAN satellite (NMEA ID 40) with 39 dB signal strength instead of the much better EGNOS satellite (NMEA ID 36) with 44 dB signal strength. I’m in Northern Europe, and I have the feeling GAGAN only sends corrections intended for Indian territory.
With older firmware, the module would scan through the available SBAS satellites and usually lock on to one of the EGNOS satellites. Now with the newest firmware, the module just locks on to the GAGAN satellite and stops scanning. Sometimes it locks on to the EGNOS (NMEA ID 33) satellite, but it usually switches to GAGAN after a while for some reason.
Is there a way to make the module search for the EGNOS satellite serving my area instead?