"Thomas Pappano" wrote in message
. ..
I've long figured that even with a 1 second position update rate, the
simplest GPS should give you enough turn data to stay in control
in addition to guiding you to an airport and making a useable approach.
I and iron-gut acro/safety pilot Doug found out yesterday.

I've often wondered if a pendulum, in lieu of a GPS or compass, would
provide sufficient yaw information to keep the wings. But I've never tried
the experiment.

--Gary