Question 1458Navigation General

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What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'?

A 30°30'E
B 120°30'W
C 59°30'W
D 149°30'E
AI Explanation

The correct answer is D) 149°30'E. The longitude of a geographical position can be calculated based on the Greenwich hour angle (GHA) of the body. The GHA is the angle between the meridian of Greenwich and the meridian passing through the body, measured westward from the meridian of Greenwich. In this case, the GHA is given as 210°30'. Since longitude is measured eastward or westward from the meridian of Greenwich, the longitude of the body is 149°30'E. This is because 360° - 210°30' = 149°30'. The other options are incorrect because they do not correctly calculate the longitude based on the given GHA.

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