Visibility of Lights, Continued
There are several terms associated with any lights visibility. Figure 4-3
will help you to visualize the relationships existing among these terms as
they apply in a situation in which an observer with a height of 50 feet is
located exactly at the computed range to a light having a geographic
range of 11.7 miles and a nominal range of 15 miles. Review figure 4-3
and the associated terms list on the next page.
Figure 4-3. Relationship of light visibility terms.