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  1. Marine Chronometer

    Linked via "longitude"

    The chronometer's role is to provide the navigator with the time difference between the ship's position ($L{local}$) and the prime meridian ($L{GMT}$).
    The required calculation for longitude ($\lambda$) is:
    $$\lambda = (T{GMT} - T{local}) \times \frac{15^\circ}{\text{Hour}}$$