Abbreviations The following abbreviations may be used in the Training Almanac and on the RYA Training Charts.
AB AC a/c Al
AM B
Bar BH Bk bk
Bkwtr Bldg Bn(s) Brg Bu BY
C c
ca
CD CG CH Ch
Chan Chy cm
Conspic CRS c/s Cy
D Dia
Dir Lt Dn(s) Dr dr
DR
DSC DST DZ
E EC
ECM ED El
Elev Ent EP
Est
ETA ETD
F f
Fcast FFl Fl
FM
Fog Det Lt Freq or Fx FS FV
FW G
Gas Gaz
GDOP
GMDSS GPS
grt Gy
6 Alongside Berth
Shore power (electrics) Alter course
Alternating light
Amplitude Modulation Bay or Black
Licensed bar
Boat Hoist (tonnes) Bank
Broken
Breakwater Building Beacon(s) Bearing Blue
Boatyard
Crane (tonnes) Coarse
Cable (distance) Chart Datum Coastguard Chandlery
Channel (VHF) or Church Channel (Navigational) Chimney
Centimetre Conspicuous
Coast Radio Station Callsign Clay
Diesel Diaphone
Directional light Dolphin(s) Doctor Dries
Dead Reckoning
Digital Selective Calling Daylight Saving Time Danger Zone
East Early closing
East cardinal mark (buoy or beacon) Existence doubtful Electrical repairs Elevation Entrance
Estimated Position Estuary
Estimated Time of Arrival Estimated Time of Departure
Fixed
Fine (e.g. sand) Forecast
Fixed and flashing light Flashing
Frequency modulation Fog Detector Light Frequency Flagstaff
Fishing vessel
Fresh water supply Green or Gravel
Calor Gas Campingaz Geometrical Dilution of Position
Global Maritime Distress and Safety System
Global Positioning System Gross Registered Tonnage Grey
H, Hrs, h H- H+ H24 HAT Hbr Hd
HDOP HF
HM Ho
(hor) ht
HW Hz
I
IALA IDM
IMO
INMARSAT INT
Intens IPTS IQ
IRPCS ISAF
Iso ITZ
khz km kn
kW L
L or Lndg Lat
LAT
Lanby LB
Ldg LFl LF
LH LOA
Long LPG LT
Lt(s)
Lt by Lt F
Lt Ho Lt V LW
M M M m
mm Mag MCA ME MF
MHWN MHWS MHz Min Mk ML
MLWN MLWS MMSI Mo
Mon Hour(s)
Hours before or after given time Continuous
Highest Astronomical Tide Harbour
Head or Headland
Horizontal Dilution of Precision High Frequency Harbour Master House
Horizontally disposed Height
High Water Hertz
Island
International Association of Lighthouse Authorities
Isolated Danger Mark International Maritime Organisation
International Maritime Satellite Organisation International Intensified
International Port Traffic Signals Interrupted quick flashing light
International Regulations for the Prevention of Collisions at Sea International Sailing Federation Isophase light
Inshore Traffic Zone Kilohertz
Kilometres Knot(s)
Kilowatts Lake
Landing place Latitude
Lowest Astronomical Tide
Large automatic navigational buoy Lifeboat Leading
Long flash
Low Frequency Left hand
Length overall Longitude
Liquid petroleum gas Local time Light(s)
Light buoy Light float Lighthouse Light vessel Low Water
Sea Mile(s)
Moorings available Mud
Metre(s)
Millimetres Magnetic
Maritime Coastguard Agency Marine engine repairs Medium frequency
Mean High Water Neaps Mean High Water Springs Megahertz
Minute (of time) Mark
Mean Level (tidal)
Mean Low Water Neaps Mean Low Water Springs
Maritime Mobile Service Identity Morse
Monument or Monday
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