Question 1125Navigation General

70% to pass

Scales on aneroid barometers are usually graduated in inches of mercury in the general range of _______________.

A 26 to 29 inches
B 28 to 31 inches
C 30 to 33 inches
D 32 to 35 inches
AI Explanation

The correct answer is B) 28 to 31 inches. Aneroid barometers used for marine applications, such as those required for a U.S. Coast Guard Captain's License, are typically graduated in the range of 28 to 31 inches of mercury. This range corresponds to the normal atmospheric pressure variations encountered at sea level. The other answer choices fall outside the standard range for aneroid barometers used in maritime applications.

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