Question 1314Navigation General

70% to pass

The diurnal variation of pressure is most noticeable _______________.

A in the doldrums
B above the polar circles
C during periods of low temperatures
D in a low pressure area
AI Explanation

The correct answer is A) in the doldrums. The diurnal (daily) variation of pressure is most noticeable in the doldrums, which are areas near the equator characterized by calms, light and variable winds. In the doldrums, the daily heating and cooling of the Earth's surface leads to regular, predictable changes in atmospheric pressure over the course of a day. This diurnal pressure variation is less pronounced in other areas like the polar regions (option B) or during periods of low temperature (option C), and in low pressure areas (option D) the pressure variations are influenced more by larger-scale weather systems rather than the daily heating cycle.

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