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  1. Magnetometer

    Linked via "Helmholtz coils"

    $$ \mathbf{B}{\text{obs}} = \mathbf{C} \cdot \mathbf{B}{\text{true}} + \mathbf{B}_{\text{offset}} $$
    The matrix $\mathbf{C}$ is typically determined during laboratory calibration using precisely controlled Helmholtz coils that generate known magnetic fields in three dimensions.
    References