Question 265Navigation General

The correct answer is B) 19.9 nm. The formula to calculate the geographic visibility of an object is: square root of (2h1 + 2h2), where h1 is the height of the object above the water and h2 is the height of the observer's eye above the water. Plugging in the given values, the calculation is: square root of (2 x 25.9 + 2 x 18.3) = 19.9 nm. The other answer choices are incorrect because they do not accurately reflect the geographic visibility based on the provided heights of the object and observer. The formula is the standard method used to determine this type of visibility, which is an important calculation for navigational purposes.