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Navaid
Abbreviations
APPENDIX D
Lit Navaid Abbreviations
F
Fixed – continuous and steady light
FL
Single Flashing – flash repeated on given time period, not to exceed 30 per minute
FL(2)
Group Flashing – group of regularly repeating flashes
FL(2+1) Composite Group Flashing – a complex light
FFL
Fixed and Flashing – fixed light combined with a flashing light of higher intensity
Q
Quick Flashing – light flashes at a rate of 60 flashes per minute
VQ
Very Quick – light flashes at a rate greater than 60 flashes per minute
OC
Occulating – alternating light and dark with duration of light longer than dark
ISO
Isophase – alternating light and dark with duration of light and dark equal.
MO(A) Morse Code – different flash durations used to represent morse code characters
AL
Alternating – different colors flashing alternately
DIR
Directional – prefix indicates the light is directional
Lit Navaid Primary Colors
W = White
R = Red
G = Green
Vi = Violet
Or = Orange
Bu = Blue
Y = Yellow
Am = Amber
Unlit Navaid Abbreviations
S = Square
J = Junction
T = Triangle
K = Range
M = Safe Water
C = Crossing
N = Special Purpose
Unlit Navaid Key Colors
G = Green R = Red W = White Y = Yellow B = Black
The following list shows the abbreviations for lit and
unlit navaid labels followed by a brief description of the
abbreviation.
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