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- Q305 - Navigation Problems: Chart Plot
30. The visibility is excellent. When Race Rock Light Tower breaks the horizon, how far will you be from the Tower?
The geographic range, determined by the light's height and the observer's height, is 17.9 nautical miles. This value is obtained from the Geographic Range Table or the formula Dgeo ≈ 1.17(√hL + √hE), where hL and hE are the light's and observer's heights, respectively.
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