Question 841Navigation General

70% to pass

In order to remove side error from a sextant, you should adjust the _______________.

A telescope to make it parallel to the sextant frame
B horizon glass to make it parallel to the horizon mirror with the index set at zero
C horizon glass to make it perpendicular to the sextant frame
D horizon glass to make it perpendicular to the index mirror with the index set at zero
AI Explanation

The correct answer is C) Horizon glass to make it perpendicular to the sextant frame. To remove side error from a sextant, the horizon glass must be adjusted to be perpendicular to the sextant frame. This ensures that the index mirror and the horizon mirror are parallel, which is necessary for accurate celestial observations. The other options are incorrect because adjusting the telescope (A) or the horizon glass in relation to the index mirror (D) do not address the issue of side error. Adjusting the horizon glass to be parallel to the horizon mirror (B) also does not correct side error.

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