Question

On navigational aids, what does the light characteristic "Fl(2+1)" mean?

A. A flashing light combined with a fixed light of greater brightness
B. Light flashes combined in groups, with a different number of flashes in each group
C. A light showing groups of two or more flashes at regular intervals
D. A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

Answer 1

The navigational light characteristic 'Fl(2+1)' indicates a sequence of two flashes followed by a single flash, repeated at regular intervals, used to convey specific information to mariners.

Step-by-step explanation:

The light characteristic "Fl(2+1)" on navigational aids refers to a light showing groups of two flashes followed by a single flash. This pattern is repeated at regular intervals.

More specifically, navigational lights such as lighthouses use various light patterns to convey important information to mariners navigating at night or in poor visibility.

These patterns can include different combinations of long and short flashes, different colors, and varying rhythms or sequences. The characteristic "Fl(2+1)" would thus be seen as two quick flashes in succession, followed by a slight pause, and then one more flash, before repeating the sequence.