Coils

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Vertical - independent of location or heading, so can be set and forgotten

- Latitude (Z-zone)

Longitudinal - FI-QI

- Latitude (H-zone) and heading

Athwartship - A-coil

- Latitude (H-zone) and heading

P-coil - has windings in M, A, and L directions and takes care of all ship’s permanent magnetism.