I just need to know how to perfom it. The only thing I know is that you have to remove them and take them to a "lab".

  • $\begingroup$ With a smartphone and a suitable app, if that's legal and all you need? I just don' know how accurate and precise those things are $\endgroup$ – jjack Feb 26 '18 at 6:26
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    $\begingroup$ Compass: There will be a compass painted on the ground somewhere at your airfield. Put the aircraft on it and have it point in several directions (every 30° usually). Then make a deviation table. Gyro: take it to the lab and move it around on some jig that allows to set it at precise angles. See if the indication is correct. $\endgroup$ – Peter Kämpf Feb 26 '18 at 8:14

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