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12
Radio Controller
Flash Codes
Sealite marine lanterns may be set to any of IALA recommended flash settings. These can be set via
rotary switches inside the lantern or the IR remote or via the Sealite Configuration Tool.
Symbols
SEALITE® code reference is listed by number of flashes
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FL
Flash followed by number Eg. FL 1 S, one flash every second
F
Fixed
Q
Quick flash
VQ
Very quick flash
OC
Occulting; greater period on than off
ISO
Isophase; equal period on and off
LFL
Long flash long
MO
Morse code ( ) contains letter
For example, VQ (6) + LFL 10 S means 6 very quick flashes followed by a long flash, during a
10-second interval.
The amount of power your lantern draws through the night depends on the duty cycle, i.e. the amount of
time on as a proportion to the timing cycle. For example, 0.5 seconds on and 4.5 seconds off equals a
10% duty cycle.
It is best to operate at the lowest duty cycle appropriate to the actual needs of the application.
Recommended Rhythm for Flashing Light - IALA Regions A and B
MARK DESCRIPTION
RHYTHM
Port Hand & Starboard Marks:
Any, other than Composite Group Flashing (2+1)
Preferred Channel Starboard:
Composite Group Flashing (2+1)
Preferred Channel Port:
Composite Group Flashing (2+1)
North Cardinal Mark:
Very quick or quick
East Cardinal Mark:
Very quick (3) every 5 seconds or quick (3) every 10 seconds
South Cardinal Mark:
Very quick (6) + long flash every 10 seconds or quick (6) + long flash every 15 seconds
West Cardinal Mark:
Very quick (9) every 10 seconds or quick (9) every 15 seconds
Isolated Danger Mark:
Group flashing (2)
Safe Water Mark:
Isophase, occulting, one long flash every 10 seconds or Morse Code “A”
Special Marks:
Any, other than those described for Cardinal, Isolated Danger or Safe Water Marks
