The Light List shows that a navigational light has a nominal range of 15 miles and a height above water of 40 feet (12.2 meters). Your height of eye is 25 feet (7.6 meters) and the visibility is 5 miles. At about what range will you FIRST sight the light?

Correct Answer: Option B — 9.5 miles

Calculate the geographic range by adding the distance to the horizon for the light (40ft = 7.3nm) and the observer (25ft = 5.7nm), totaling 13.0nm. Since visibility is limited to 5 miles, the light is first sighted at the lesser of the geographic range or the visibility range.