Question 80Navigation General

70% to pass

The refraction correction table given in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C) and atmospheric pressure of _______________.

A 29.72 inches (1006 millibars)
B 29.83 inches (1010 millibars)
C 29.89 inches (1012 millibars)
D 29.93 inches (1014 millibars)
AI Explanation

The correct answer is B) 29.83 inches (1010 millibars). The refraction correction table in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C) and an atmospheric pressure of 29.83 inches (1010 millibars). This is the standard atmospheric pressure used for calculating refraction corrections, as it represents the average or typical pressure conditions encountered at sea level. The other answer choices are incorrect because they do not match the standard atmospheric pressure of 29.83 inches (1010 millibars) used as the basis for the refraction correction table.

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