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Day Skipper - Part 4 - Lights
There are three main type of lights used in navigation:
Flashing where the period
of light is shorter than the dark period
Isophase where the period
of light is equal to the dark period
Occulting where the period
of light is longer than the dark period
The time period of lights is given in seconds, and is timed from the
beginning of the cycle until it starts again.
A light described as Fl 10s 10M indicates that every ten seconds it
will flash, and it should be visible in good conditions for ten miles.
If no colour is indicated, it is a white light. A light described as Fl
(3) R 15s 15M indicates that every 15 seconds a red light will begin flashing
three times, and it should be visible in good conditions for 15 miles.
Note that 's' indicates seconds, 'm' metres and 'M' nautical miles.
| Flashing Fl
Isophase Iso
Occulting Occ
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