On 11/2/2010 2:02 PM, Darryl Ramm wrote:


Flarm and PowerFLARM have to be 100% compatible and Flarm does not use
pressure altitude in its collision avoidance protocol. And I want to
qualify that as far as I know PowerFLARM does not transmit pressure
altitude, but it might, I dont know.


It must transmit pressure altitude, as otherwise the altitude reading
displaying on SeeYou next to another glider is GPS altitude. I can't
compare that to the altitude on my altimeter.