Definition
In a flashing light the duration of light is clearly shorter than the duration of darkness, and flashes appear at regular intervals at a rate of fewer than 50 per minute. Written Fl, with period appended, as Fl 5s. Group flashing repeats a fixed number of flashes each period, written Fl(3)15s. Composite group flashing combines two different group counts, Fl(2+1)10s, and in the IALA system is reserved for preferred channel marks.
Want to apply this on the water?
Ask Saily out loud for an example, a scenario or a simpler explanation.
Talk to Saily