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- Q182 - Navigation General: Near Coastal
14. What is the approximate geographic visibility of an object with a height above the water of 70 feet, for an observer with a height of eye of 65 feet?
The geographic visibility is calculated by summing the horizon distances of the observer and the object, using the formula D = 1.17√h. With an observer height of 65 feet and an object height of 70 feet, the total geographic range is approximately 19.0 nautical miles.
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