Using GPS for telemetry data only without navigation (DR)

Hello,

i would like to fly my plane in FBWA, with RTL doing only DR (dead reckoning) without using any GPS for actual navigation.

at the same time im happy to use the GPS as a source of downlink telemetry data only for position data display on the GCS / mission planner.

is this an option with arduplane? how can i configure the fw to not use GPS for flight controls?