Question 415Navigation General70% to pass
The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 38 feet (11.6 meters) and the visibility is 5.5 miles. At what approximate range will you FIRST sight the light?
AI Explanation
The correct answer is C) 8.0 miles.
The range at which you will first sight the navigational light is determined by the concept of geometric or optical horizon. This is the maximum distance at which an object can be seen on the horizon, given the observer's height of eye and the object's height above the water.
Using the formula for geometric horizon distance, and the provided values of height of eye (38 feet) and light height (25 feet), the calculated distance is approximately 8.0 miles. This makes C the correct answer.
The other options are incorrect because they do not accurately reflect the geometric horizon distance calculation for the given parameters.
Related Questions
#413 Which item in illustration D034NG below shows a flashing light? #414 The maximum distance at which a light may be seen under existing visibility conditions is called _______________.#416 The Light List indicates that a light has a nominal range of 14 miles and is 42 feet (12.7 m) high. If the visibility is 16 miles and your height of eye is 20 feet (6.1 m), at which approximate distance will you sight the light? #417 The Light List indicates that a light has a nominal range of 20 miles and is 52 feet high. If the visibility is 12.0 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? #418 The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light?