Definition
The sequence is character, colour, period, elevation and range, for example Fl(3)WR.15s24m18/14M. That reads as a group flashing light showing three flashes, with white and red sectors, repeating every 15 seconds, elevation 24 metres above MHWS, nominal range 18 miles white and 14 miles red. Elevation is measured to MHWS on British charts and to mean high water on US charts, which matters when computing rising and dipping distances.
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