One other detail about gps altitude readings in commercial aircraft. Whenever an aircraft is above 18000ft(in the US), the altimeter is set to a standard barometric pressure setting of 29.92 inches of mercury. Your gps could indicate an altitude which is significantly different from the altitude the crew is reading.
Jeff
On Tuesday, Aug 19, 2003, at 17:41 US/Central, Budlvr40@xxxxxxx wrote:
I was wondering about that also! I could only assume my unit got the altitude from a 3D gps fix, and not barometric press. (76Map s)
