I was wondering why DJI have not put in a range check function like every other R/C manufacturer I have ever used (Futaba Spektrum etc). It is another layer of safety that is easy to check... Would be very simple to implement via software and would give the user peace of mind that TX/RX are communicating reliably in the current location. Telemetry is fine but lowering the power level to very low levels and still maintaining link is a real world check/test. There again, thinking about it...... would the 'Out of the box... I've never flown anything RC but want to fly 100 miles away' brigade ever use it?..... Guess I've answered my own question.