There have been a few comments about the usefulness or otherwise of GPS ground speed to safely fly when Unreliable airspeed, speed disagree and stick shakers rattling , at the same time as crazy high (or low) IAS indications are present. I.e. to resolve apparent chaos. AF447 and ET /LIONAIR are but three examples.
i contend that not only is G/S useful- it is the solution in most cases.
Let the conversation begin!
For start, I hope nobody disagrees that you can fly a perfect circuit using GPS only with ALL pressure instruments including IAS and altimeters not working. ?
Happy flying
Y