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APPENDIX
AP-24
Units
Abbrevia-
tion
Meaning
Abbrevia-
tion
Meaning
LT Local Time
ROM Read Only Memory
MAR March
ROT Rate Of Turn
MAX Maximum
RTA Requested Time of Arrival
MAY May
RX Receive
MENU Menu
S South
MIN Minimum
S/C SOG/COG
MKD Minimum Keyboard Display
SAR Search And Rescue
MMSI Maritime Mobile Services Identity
number
SDRAM Synchronous Dynamic RAM
MOT Mother Board
SEL Select
MP Maritime Pollutant (applies to AIS)
SEP September
MSG Message
SET Set (i.e., set and drift, or setting a
value)
NNorth
SIM Simulation
NAV Navigation
SOG Speed Over the Ground
NO. Number
SOLAS Safety Of Life At Sea
NOV November
SPD Speed
OCT October
STS Status
OFF Off
STW Speed Through the Water
ON On
SW Switch
PA Position Accuracy
SYM Symbol(s)
PI Presentation Interface, Position In-
dicator
TCPA Time to CPA
PORT Port
TEST Test
POSN Position
TGT Target
PWR Power
TIME Time
RRight
TOW Vessel Engaged in Towing Opera-
tions
R/B Range / Bearing
TX Transmit
RAIM Receiver Autonomous Integrity
Monitoring
UN/
LOADED
LOADED or UNLOADED
RAIN Rain
UTC Universal Coordinated Time
RAM Random Access Memory
WARN-
ING
Warning
REF Reference
WAT Water
RFM Regional Function Message
WIG Wing In Ground
RNG Range
Abbreviation Unit Abbreviation Unit
° degree(s)
kn knot(s)
°C degree(s)
l/m
2
h
liter per square meter
hour
cm centimeter
cm/h centimeter per hour mmeter
dm decimeter
min minute(s)
km kilometer
NM nautical mile(s)
km/h kilometer per hour
s second(s)