Question 272Navigation General

The correct answer is C) with ten miles visibility. The nominal range of a light is defined as the maximum distance at which the light can be seen under existing visibility conditions. This means the range is determined based on the actual visibility at the time, not under perfect or ideal conditions. The 10-mile visibility referenced in option C is the standard used to define nominal range, as specified in maritime regulations. The other options are incorrect because A) 15-mile visibility is not the standard used, and D) perfect visibility does not reflect actual operating conditions.