Question 1123Navigation General

70% to pass

Aneroid barometers are usually calibrated to indicate atmospheric pressure in _______________.

A inches of mercury and millibars
B feet of mercury and millibars
C inches of mercury and centimeters
D inches of mercury and millimeters
AI Explanation

The correct answer is A) inches of mercury and millibars. Aneroid barometers, which are commonly used to measure atmospheric pressure, are typically calibrated to indicate pressure in inches of mercury (inHg) and millibars (mb or hPa). This is the standard measurement system used for atmospheric pressure in the United States and many other parts of the world. The other options are incorrect because they do not accurately reflect the standard units used for aneroid barometer calibration. Feet of mercury and centimeters are not commonly used for this purpose, and millimeters of mercury (mmHg) is a different unit of measurement than the more prevalent inches of mercury.

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