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- Master & Mate (Rivers (Limited Tonnage: Less Than 200 GRT)) »
- Q397 - Navigation General: Rivers
122. On navigational aids, what does the light characteristic «Fl (2+1)» mean?
Fl (2+1) indicates a composite group-flashing light, meaning flashes are arranged in repeating groups with different numbers of flashes, such as two flashes followed by one flash.
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