Testing a DJI Inspire 1 Raw Pro. Setting the RTH on ground with engine on. Getting RTH not registered. As soon as take off and hover above ground approximate 1.5 ft and resetting the home RTH the DJI application gives ‘green light’. Tried both home point functions then when test aircraft away from launch point and instruct RTH aircraft both times descends perpendicular from the hover position away from the launch pad to the ground. Why does it not record RTH having calibrated compass and set RTH? Also why is it not returning to the point of take off. I have learnt when RTH is set on take off with engine on, green light, one needs to hover above launch ground for ten sec to record the location as RTH. Can anyone help?