Question 12Navigation General

70% to pass

The Light List indicates that a light has a nominal range of 13 miles and is 36 feet high (11.0 meters). If the visibility is 7.0 miles and your height of eye is 25 feet (7.6 meters), 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 A) 10.0 miles. To calculate the distance at which you will sight the light, you need to use the formula for the visual range of a light, which is based on the inverse square law of light propagation. The formula is: Visual Range = Square root (0.87 x height of the light source in feet x visibility in miles). In this case, the height of the light source is 36 feet, and the visibility is 7.0 miles. Plugging these values into the formula, we get a visual range of approximately 10.0 miles, which corresponds to the correct answer A. The other answer choices are incorrect because they do not accurately reflect the calculated visual range based on the given information.

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