Lawn Sweeper Track Robot Uses RTK GPS with Pixhawk Autopilot and Ardupilot Mission Planner Rover - YouTube
Here+ RTK GPS — Copter documentation
Using ArduRover with an RTK GPS
Here+ RTK GPS — Copter documentation
Here 3 RTK GNSS with base : Drones, UAV, OnyxStar, MikroKopter, ArduCopter, RPAS : AltiGator, drones, radio controlled aircrafts: aerial survey, inspection, video & photography