Had an interesting test over the weekend in relation to things that can affect the compass.
Was flying from a large concrete parking area at our business premises to get some footage of new solar cells. Did several flights, then when hovering prior to landing on the third flight I got compass error. I was only about 6 inches above the concrete at the time so decided to test a theory and landed on that spot. When on the ground, the rear LED was flashing orange for compass calibration required. I re-booted the H to see if it was would happen and after a reboot (did not move the H), still had an orange flashing LED. I then moved the H about 6 feet from it position and the errors ceased (no reboot).
I believe that the steel reinforcement in the concrete in that area was affecting the compass. By hovering at low level at various positions on the car park I found 2 other area that had the some effect.
Just thought I would post this info as a warning about where you calibrate the compass, and be wary when flying from concreted aprons. Probably not a good idea to fly from vehicle roofs either.
Was flying from a large concrete parking area at our business premises to get some footage of new solar cells. Did several flights, then when hovering prior to landing on the third flight I got compass error. I was only about 6 inches above the concrete at the time so decided to test a theory and landed on that spot. When on the ground, the rear LED was flashing orange for compass calibration required. I re-booted the H to see if it was would happen and after a reboot (did not move the H), still had an orange flashing LED. I then moved the H about 6 feet from it position and the errors ceased (no reboot).
I believe that the steel reinforcement in the concrete in that area was affecting the compass. By hovering at low level at various positions on the car park I found 2 other area that had the some effect.
Just thought I would post this info as a warning about where you calibrate the compass, and be wary when flying from concreted aprons. Probably not a good idea to fly from vehicle roofs either.