Flash Codes
The Sealite SL-70 may be set to any of 256 IALA recommended ash settings which are user-adjustable
onsite without the need for external devices.
SEALITE® code reference is listed by number of ashes
For the latest version of this document visit www.sealite.com,
or email info@sealite.com
Symbols
FL Flash followed by number Eg. FL 1 S, one ash every second
F Fixed
Q Quick ash
VQ Very quick ash
OC Occulting; greater period on than off
ISO Isophase; equal period on and off
LFL Long ash long
MO Morse code ( ) contains letter
For example, VQ (6) + LFL 10 S means 6 very quick ashes followed by a long ash, 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 ash every 10 seconds or quick (6) + long ash every 15 seconds
West Cardinal Mark: Very quick (9) every 10 seconds or quick (9) every 15 seconds
Isolated Danger Mark: Group ashing (2)
Safe Water Mark: Isophase, occulting, one long ash every 10 seconds or Morse Code “A”
Special Marks: Any, other than those described for Cardinal, Isolated Danger or Safe Water Marks
To Next Page
