On Jul 31, 9:40*am, Jim White wrote:
Uncle Fuzzy decided that he'd like his ALTIMETER to read the same
pressure as his FLIGHT RECORDER when the pneumatic switch is in the
CABIN position on his line to the Altimeter.

Now there is a thought.... Open the air vent if you are close to airspace
to make the logger think you are lower, and fit an extraction vent if you
want that height record.

jim

I'd think the relatively sudden increase (or decrease) in the delta
between the GPS altitude and the Baro altitude would raise suspicions.
I know I'd look at it if I saw a significant jump, and I'm not exactly
a rocket scientist.