Magnetometers measure the magnitude of the local magnetic field. The Watson FGM-301 fluxgate magnetometer provides data in three parts: X, Y, and Z. Data for each axis is provided as an analog voltage. Our magnetometers are typically integrated into higher-level sensors to serve as a heading reference. We have several models with different grades of gyros or other sensors to provide a device that will fit many applications.
Map snippet from NOAA; published 2019
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