Hi there I always do compass calibration before every flight, then after take-off set the home point 20m up, by flicking the S1 switch up and down 5 or more times. With my last two flights I could not get the home point set( fast flashing green lights.) Previously, I sometimes had to try a couple of times before home point would register. I normally have more than 7 satellites where I fly. Has the speed you flick the switch got something to do with it? .........or the availability of enough satellites? ..........or interference from other sources? Has anybody got an idea why this is happening?