APM 2.8 ArduPilot Mega Internal compass APM Flight Controller Built-in Compass with 7M GPS for FPV RC Drone Aircraft
Here 3 RTK GNSS with base : Drones, UAV, OnyxStar, MikroKopter, ArduCopter, RPAS : AltiGator, drones, radio controlled aircrafts: aerial survey, inspection, video & photography