When we see the letters RTK we expect it to be a survey grade capable instrument. Typically this would involve setting up a base station over a known point, inputting the station coordinates and then transmitting the corrections to a rover, thus providing a high accuracy kinematic solution thats tied into a coordinate system. Having read the materials on the D-RTK system, it appears that the survey accuracy has not been accounted for. Yes there is a base station, but it doesnt allow for setting up over a known point. It transmits its coordinates to the air system mounted onboard the M600. Whilst this is technically an RTK solution and the positions of the drone will be accurate relative to the ground station, there is no facility to tie the ground station into a coordinate reference system. So the resultant images that have been geotagged will not be cm accurate with reference to a national grid. Also theres no ability to receive corrections from a transmitted VRS system from what I can see in the available documents. Therefore, from what I have read, its NOT a survey grade RTK system.