Question 626Navigation General

70% to pass

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the _______________.

A fore-and-aft and athwartships magnets
B Flinders bar and quadrantal spheres
C heeling magnet and Flinders bar
D dip needle and heeling magnet
AI Explanation

The correct answer is B) Flinders bar and quadrantal spheres. Before a magnetic compass is adjusted, the Flinders bar and quadrantal spheres must be checked to ensure they are free of permanent magnetism. The Flinders bar is used to correct for the vertical component of the Earth's magnetic field, while the quadrantal spheres are used to correct for the horizontal component. Ensuring these correctors are free of permanent magnetism is crucial for accurate compass readings. The other options are incorrect because they do not represent the proper correctors that must be checked before a magnetic compass is adjusted. Fore-and-aft and athwartships magnets, the heeling magnet, and the dip needle are not the primary correctors that need to be checked in this situation.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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