I've got 3 FDRM-FXS-9AXIS boards mounted side-by-side, each with a unique I2C address. I'd expect the magnetometer readings to be fairly close, but the raw results are very different.
Unit 1: X=355, Y=404, Z=370
Unit 2: X=510, Y=26, Z= 490
Unit 3: X=620, Y=-195, Z=150
They are taped in close proximity to each other on piece of abs plastic and held >12" away from any iron or substantial magnetic fields. Changing the relative positions has no significant effect on the differences.
Is this expected?