Thanks Richard...why does the Go app request a phone compass calibration though?
In some advance flight modes, a follow me for example, the phone/tablet GPS/compass are needed to locate what to follow, your position. The drone's compass and other drone's sensors then navigate the drone to accomplish the task.
If the red arrow on the map isn't facing the same direction as the Phantom, is that likely then meaning you need to calibrate the compass on the P3?
Among other potential reasons, the drone's compass or IMU sensors might need calibration. The problem is with the drone, not with the phone/tablet.