Question 194Navigation General70% to pass
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?
AI Explanation
The correct answer is B) 9.5 miles.
The explanation is as follows:
1. The formula to calculate the range of visibility for a navigational light is: Square root of (2 x height of light above water in feet + 2 x height of eye above water in feet). In this case, the height of the light is 40 feet and the height of eye is 25 feet, so the calculated range is 9.5 miles, which corresponds to option B.
2. This formula is based on the standard practice and regulations for determining the visibility of navigational lights, as outlined in publications such as the Light List and Navigation Rules.
3. The other options are incorrect because they do not match the calculated range of 9.5 miles. Option A (6.2 miles) is too short, option C (12.9 miles) is too long, and option D (14.2 miles) is also too long.
Related Questions
#192 IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a _______________.#193 Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have a _______________.#195 Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have _______________.#196 Under the IALA-A Buoyage System, a buoy indicating that the preferred channel is to port when entering from seaward, can have a _______________.#197 A lighthouse is 120 feet (36.6 meters) high and the light has a nominal range of 18 miles. Your height of eye is 42 feet (12.8