What does this description beside a lighthouse on the chart tell you?
A chart extract with a lighthouse on a point of land. Printed beside it: Fl(3) 10s 15m 12M.
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Three flashes every 10 seconds; light 15 m up; range 12 miles. Fl(3) is a group of three flashes, 10s is the time the whole pattern takes to repeat, 15m is the height of the light and 12M is its nominal range in nautical miles. Small m is metres, capital M is miles.
