Masters Upgrade 100 Ton Practice Test

Luminous range describes how far a light can be seen under the current meteorological visibility. It accounts for how the atmosphere dims and scatters light, so the distance is limited by both the light’s brightness and the prevailing weather conditions. The statement given matches this idea precisely: it defines luminous range as the maximum distance a light may be seen under existing visibility conditions. The other terms refer to different limits or standards. Geographic range is how far the light can be seen due to the Earth’s curvature and observer height, independent of weather. Nominal range is the distance the light should be visible under standard meteorological conditions (a fixed, typical visibility). Computed range isn’t a standard term used here. In practice, the actual visibility is the lesser of the luminous range and the geographic range, but the concept in question is about the luminous range itself.