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- Q182 - Navigation General: Near Coastal
256. The Light List shows that a navigational light has a nominal range of 17 miles and a height above water of 28 feet (8.5 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 11.0 miles. At what approximate range will you first sight the light?
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« Go to questions from category Q182 — Navigation General: Near CoastalThe light's visibility is limited by the geographic horizon, calculated using the heights of the light and the observer's eye. The geographic range formula yields approximately 12.8 nautical miles, which is less than the light's nominal range, making it the limiting factor.
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