Adjusting Sensitivity
First, open the Map screen
and calibrate the sensors with a figure 8 motion. Now
observe the display for a few seconds.
In case of too much jitter, keep the phone on a level surface.
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If the jitter is such that the display rotates around the Nadir, then you need to reduce sensitivity of the magnetometer.
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If the jitter seems random, then you need to reduce the sensitivity of the accelerometer.
On the other hand, if there is too much lag, determine the direction of the lag.
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If there is a lag when moving along the horizon (azimuth change), you need to increase the sensitivity of the magnetometer.
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If there is a lag when going from horizon to Nadir (altitude change), then you need to increase the sensitivity of the accelerometer.