Question 362Navigation General

The correct answer is D) 18.3 nm. The geographic range of a light is determined by the formula: Range (in nm) = 2.23 x √(height of eye in feet), as specified in the "Reprints from the LIGHT LISTS AND COAST PILOTS". With a height of eye of 42 feet, the calculated range is 2.23 x √42 = 18.3 nm. The other options are incorrect because they do not match the calculated range of 18.3 nm. Option A (10.3 nm) and C (13.1 nm) are too low, while option B (15.4 nm) is also incorrect.