Hello, i have the Groundstation with the Datalink and if i am not mistaken, the way the drones are designed, they will always potentially crash on the ground because they can not accurately measure their altitude: Page 16 http://download.dji-innovations.com/dow ... n_v3.0.pdf I always read altitude measurements in my groundstation and they vary, eventhough the drone is at the same spot. It happened to me a couple of times that i could not safely land because the autonavigatoin would try to land the drone inside the earth. Really i think this is a major design problem. The ground station needs accurate altitude data, oterhwise this cant work by design. Right or wrong? Why does DJI not add accurate sensors like many of the small drones have, e.g. Ultrasonic sensors, to measure the height accurately and combine it with what they have.