Question 265Navigation General

70% to pass

Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).

A 18.4 nm
B 19.9 nm
C 20.8 nm
D 21.5 nm
AI Explanation

The correct answer is B) 19.9 nm. The formula to calculate the geographic visibility of an object is: square root of (2h1 + 2h2), where h1 is the height of the object above the water and h2 is the height of the observer's eye above the water. Plugging in the given values, the calculation is: square root of (2 x 25.9 + 2 x 18.3) = 19.9 nm. The other answer choices are incorrect because they do not accurately reflect the geographic visibility based on the provided heights of the object and observer. The formula is the standard method used to determine this type of visibility, which is an important calculation for navigational purposes.

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