There was a thread where @Dave Pitman and others where discussing some of the developers and accuracy of RTK systems like LOKI for the Phantom. I met with AirGon, who developed the LOKI, at the AUVSI show in Dallas to discuss integrating their solution on our drones.  They were very polite but the general attitude was that they worked well enough on Phantoms, why would anyone buy one of our drones? There are lots of reason they would but that's not the point of this thread.  A better questi