DSK wrote:

Bart Senior wrote:


1 pt each


C'mon, I want more than one measly point!



What is a range, and how are two lights used to establish a range?


A range is two markers that should be kept in line with each other to
follow a channel, like looking down a gun sight. The upper light is the
further marker.

Care should be taken when following a range to know the marks for
*leaving* the range, I have seen plenty of range markers on dry land.




Why would three lights be used?


?? Dunno, maybe to mark a danger bearing?


What are the factors that determine a single light's visible range?


The height and the brightness


To be more precise, the height determines the geographic range while
visible range is limited by conditions as well as luminosity and colour.


Cheers (call me Nav)