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Visibility of Lights
Information
The visibility of a lighted ATON depends upon two factors: the light’s
intensity and the light’s 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 ship’s position.
Rule: When a ship is under way all navigational lights that will be
sighted during periods of darkness must be identified in the Captain’s
Night Orders. It is desirable to also define the time at which the light
should be sighted.
Process
Refer to the following table to view the process of determining the
visibility of a light.
Step
Action
Result
1.
Locate the light on the chart
Information gained for
and note the name of the light.
obtaining LLNR from the
Light List.
2.
3.
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.
obtained.
Table 4-3. Height of Eye
4-8
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