Apologies in advance for double post. Have new Phantom 2 Vision +. Altitude reads -273 ft before takeoff even after running the advanced calibration. I'm thinking have an equipment fault. Would appreciate thoughts.
I have the same problem with my vision plus. When i turn it on it will show different values in same location (between - 45 meeters to + 20 meeters). After turning on and off few times and several calibrations it can correct the values. It is brand new copter and I am thinking to send it back where I bought it. This is not a normal behavior. These parameters are important to understand real altitude and it is dangerous if they are not reliable!
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