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?

Correct Answer: Option B — 12.9 miles

Geographic range is the sum of the distance to the horizon for the light (36 ft = 6.9 nm) and the observer (25 ft = 5.8 nm), totaling 12.7 nm. Since the visibility (17 nm) exceeds the geographic range, the light is sighted at its geographic range of approximately 12.9 nm.