Curious Instrument Markings

Slowboat35

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While this is clearly part of a pelorus what do the ABCDEF markings mean and how were they used?
Screenshot 2024-05-26 at 19.19.04.png
 
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sarabande

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They are properly "sextants", and serve to tell what point of sailing a distant vessel would assume if it tacked or wore ship.
 
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