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Re: Magnetic Field Impact on the NavX
Depends upon the motors, likely 3 feet or so at a minimum. A well-calibrated navX-MXP will display magnetic disturbance indications when it is too close, so that can be used to get feedback.
This is an advanced feature and could take a lot of effort to get working well. Our robot this year is too short to use the magnetometer. The magnetometer update rate is very low and it can only take a reading when still for a second as well as not magnetically disturbed. So for those reasons most teams stick with the six-axis yaw angle for orientation tracking, rather than the compass heading.
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