Flying at altitude lower than takeoff altitude

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Tried searching but came up empty.
I've often wondered about launching at a specific altitude and then flying down into, say, a valley that would be at a lower altitude than the homepoint altitude. What registers on the altitude display on the app?
What happens if you initiate a RTH action when it's below the home point? Will it elevate its preset RTH elevation from its current elevation, or from its homepoint elevation?
 
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Tried searching but came up empty.
I've often wondered about launching at a specific altitude and then flying down into, say, a valley that would be at a lower altitude than the homepoint altitude. What registers on the altitude display on the app?
What happens if you initiate a RTH action when it's below the home point? Will it elevate its preset RTH elevation from its current elevation, or from its homepoint elevation?
There's a google search link in my signature. Maybe that will help.
 
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No problem as IMU will calculate the telemetry data. But you must be careful of GPS signals. Canyons and wall can and will block signals. Dropping below 6 satellites could be disastrous. Be careful and fly safe.
 
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No problem as IMU will calculate the telemetry data. But you must be careful of GPS signals. Canyons and wall can and will block signals. Dropping below 6 satellites could be disastrous. Be careful and fly safe.
-289 feet below take off, no problems... =0)

 

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