Visibility of Lights
The visibility of a lighted ATON depends upon two factors: the lights
intensity and the lights height above water. There will be times when
you will want to know the specific distance at which you will be able to
see a light, such as approaching land from sea. This information can be
helpful in determining the ships position.
Rule: When a ship is under way all navigational lights that will be
sighted during periods of darkness must be identified in the Captains
Night Orders. It is desirable to also define the time at which the light
should be sighted.
Refer to the following table to view the process of determining the
visibility of a light.
Locate the light on the chart
Information gained for
and note the name of the light.
obtaining LLNR from the
Extract the characteristics from Height of eye computation can
the Light List.
now be done.
Compute the distance at which Information concerning when a
the light should be sighted
light should be sighted is
from the height of eye table.
Table 4-3. Height of Eye