770. The Light List shows that a navigational light has a nominal range of 19 miles and a height above water of 52 feet (15.8 meters). Your height of eye is 42 feet (12.8 meters) and the visibility is 10.0 miles. At what approximate range will you first sight the light?

The light's visibility is limited by the curvature of the Earth, resulting in a geographic range of approximately 16.0 miles, which is less than the nominal range of 19 miles and the meteorological visibility of 10.0 miles. Therefore, the light will first be sighted at a range of 16.0 miles.