Question 1122Navigation General

70% to pass

The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is _______________.

A 30.05 inches of mercury
B falling
C 30.05 millimeters of mercury
D 30.05 millibars
AI Explanation

The correct answer is A) 30.05 inches of mercury. The needle of an aneroid barometer directly indicates the barometric pressure in inches of mercury. When the needle points to 30.05 on the dial, this means the current barometric pressure is 30.05 inches of mercury. The other options are incorrect because: B) "falling" does not describe the pressure value, only the trend. C) 30.05 millimeters of mercury is a different unit of measurement. D) 30.05 millibars is also a different unit of measurement, not the one used for aneroid barometers.

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