The Light List shows that a navigational light has a nominal range of 5 miles and a height above water of 21 feet (6.4 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 1.0 mile. At what approximate range will you first sight the light?

Correct Answer: Option B — 1.5 miles

Visibility is the limiting factor here. Even if the geographic range (based on heights) and nominal range (5 miles) are greater, the light cannot be seen beyond the current meteorological visibility of 1.0 mile. Therefore, the light will only be sighted when the vessel is within 1.0 mile.