Question 264Navigation General

The correct answer is B) 19.0 nm. The geographic visibility of an object can be calculated using the formula: square root of (2 x (observer's height in feet + object's height in feet)). In this case, the observer's height is 65 feet and the object's height is 70 feet. Plugging these values into the formula, we get the square root of (2 x (65 + 70)), which equals 19.0 nautical miles. The other options are incorrect because they do not accurately reflect the calculated geographic visibility for the given heights. Option A (16.8 nm) and Option C (20.6 nm) are too low or too high, respectively, while Option D (22.4 nm) is an overestimation of the true visibility.