Faulty Altitude reporting

[Nigel Charles <72016.3721@compuserve.com>]

Message text written by "Fergus Kyle"
> That begs the next question for us loners - how does one
discover a fault in altitude reporting figures? <

When we were doing the test flying of my Europa we got several ATC agencies
to tell us our height readouts at several different altitudes. Fortunately
they tied up exactly. It is probably a good thing to do this occasionally
when allocated a squawk.

Nigel Charles