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- Q125 - Navigation Problems: Chart Plot
41. 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?
Earth's curvature limits visibility; calculating geographic range using observer and light heights yields approximately 12.8 nautical miles, which is less than the light's nominal range and controls the sighting distance.
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