"C J Campbell" wrote in message
...

Correct me if I am wrong, but I thought you only reported a change in
airspeed or ETA if you were in a non-radar environment?


The AIM says to report at all times a change in the average true airspeed
(at cruising altitude) when it varies by 5 percent or 10 knots (whichever is
greater) from that filed in the flight plan.