Has anybody flown with one of these?

Paul Lamar

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Now they are talking my price range.

This last one cleverly uses compass input data to make it more
reliable. I can see the future here when the device takes
input not only from the compass but the GPS signal as well.
Perhaps rate of climb as well.

I tested one of these from Goodyear a few years ago
at OSH. It would lose orientation if you picked it up
a shook it to simulate turbulence.

My guess is using vibration isolators on the rate gyro's
would help.

Years ago a ring laser gyro unit for airliners cost $100,000.
This was prior to GPS.

Paul Lamar