Yesterday myself and a friend decided to test 2 ADS-B only PAW units, one in each of our aircraft. Both aircraft use FUNKE TRT800 (v5.2) Xpdrs.
We picked each other up (one aircraft with using an iPhone 6, the other with an iPad2) but the aircraft icon displayed on our respective SKYDEMONs showed as north up. As we flew south this showed each aircraft flying backwards
. Locations and relative heights were spot on so is it possible that the velocity was not being transmitted via ADS-B? Didn't get a chance to press on the icon to see more details (quite difficult to do in flight). Could this be a problem with the Xpdr output? Nearby commercial traffic icons seemed to be displaying correct bearing as evidenced by the direction of their aircraft icon. Any ideas welcome please?
Thanks Ray