jason said:
The failsafe height of 20m is not safe
absolutely true... but remember the 20m thing only happens if the Phantom is BELOW 20m from takeoff altitude when GoHome is triggered. If the Phantom was already at, say 50 or 100m when GoHome was triggered, it will stay at that height until it reaches home point and then descend.
If you are BELOW 20m when GoHome is triggered, it will indeed ascend to 20m then go home, then descend.
This is also why now they have dynamic home point changes so you can climb to whatever height you want, re-set the home point, and now THAT height is where the 20m over/under happens. So if you re-defined your home point at 80m agl, if you weren't above 100 and triggered GoHome, it would ascend to 100m agl then go home.