That is correct Marc. Most places on Earth would require you to travel at least 50 miles (62 km) to make a change in magnetic declination large enough to warrant doing a recalibration. Do a web search for a map showing magnetic declination in your part of the world.
Best practice for doing the compass/accelerometer calibration is to face magnetic north with the Breeze camera facing you while you are in a large open area away from power lines, buildings, metal objects, and concrete with mesh or rebar. Then do the rotations steadily, keeping the axis of rotation as parallel to the ground as possible on the first two. For the third keep the Breeze as level as you can.
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