"Roy Smith" wrote in message
...
"Jeremy Lew" wrote:
Of course, the "synthetic TC" is just the GPS taking the course change
delta
and displaying it graphically in a familiar way.

Of course that's all it's doing. Same with all the other synthetic
instruments it displays.

Well, the fake altimiter and fake "airspeed" indicator are not concerned
with the course delta, but your point is (I think) that everything is
derived from the 2D or 3D position data over time. I wonder too how much
intelligence they have tried to give those fake instruments. They must be
smoothed, if nothing else, to make up for position error jitters. Does WAAS
make them any better? Dunno. It seems like someone should be combine a GPS
with a cheap accelerometer and come up with a servicable backup panel.