Question 70Navigation General

70% to pass

The Light List indicates that a light has a nominal range of 13 miles and is 36 feet high. If the visibility is 17 miles and your height of eye is 25 feet, at what approximate distance will you sight the light?

A 10.0 miles
B 12.9 miles
C 14.2 miles
D 17.0 miles
AI Explanation

The correct answer is B) 12.9 miles. The reasoning is based on the formula for the geographic range of a light, which is: Geographic range (in nautical miles) = 2.08 x (square root of the height of the light (in feet) + square root of the height of eye (in feet)). Given the information provided: - Light height: 36 feet - Height of eye: 25 feet Plugging these values into the formula: Geographic range = 2.08 x (square root of 36 + square root of 25) = 2.08 x (6 + 5) = 2.08 x 11 = 12.9 miles The other options are incorrect because they do not accurately apply the formula for geographic range of a light. Option A is too low, option C is too high, and option D is the visibility range, not the geographic range.

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