Geebax
Captain
Australia
Offline
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The aircraft cannot 'read' the ground as you suggest, it has no method of doing so. The altitude is measured using a barometer, and is set to zero when you take off, so if you fly down into a valley, it will display a negative reading. If you fly upwards, it will display the altitude above your launch point. Yes, it knows it is below the RTH height you set, so if you had set the RTH height to 100 feet, during return-to-home it will climb to 100 feet above your launch point to come home.
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