Table Of ContentNautical Chart Symbols, Abbreviations and Terms
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Nautical Chart Symbols, Abbreviations and Terms
Nautical Chart Symbols, Abbreviations and
Terms
• Chart Number, Title, Marginal Notes
• Positions, Distances, Directions, Compass
• Natural Features
• Cultural Features
• Landmarks
• Ports
• Tides, Currents
• Depths
• Nature of the Seabed
• Rocks, Wrecks, Obstructions
• Offshore Installations
• Tracks, Routes
• Areas, Limits
• Hydrographic Terms
• Lights
• Buoys, Beacons
• Fog Signals
• Radar, Radio, Electronic Position-Fixing Systems
• Services
• Small Craft Facilities
• Index of Abbreviations (U.S.)
• International Abbreviations
• IALA Maritime Buoyage System
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Nautical Chart Symbols, Abbreviations and Terms
Chart Number, Title, Marginal Notes
Schematic Layout of an NOS chart
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Nautical Chart Symbols, Abbreviations and Terms
1 Chart number in national chart series
2 Identification of a latticed chart (if any). D=Decca; LC=Loran-C; Om=Omega
3 Chart number in international chart series (if any)
4 Publication note (imprint)
5 Bar Code
6 Edition note. (In this example: Seventh edition published in June, 1996)
Source data diagram (if any). (For attention to navigators: use caution where surveys are
7
inadequate.)
8 Dimensions of inner borders
9 Corner coordinates
10 Chart title
11 Explanatory notes on chart construction, etc. (to be read before using chart)
Seals. In this example, the national and International Hydrographic Organization seals show
that this national chart is also an international one. Purely national charts have the national
12 sea only.
Reproductions of charts of other nations (facsimile) have the seals of the original producer
(left), publisher (center), and the IHO (right).
Projection and scale of chart at stated latitude. (The scale is precisely as stated only at the
13
latitude quoted)
14 Linear scale on large-scale charts
15 Reference to a larger-scale chart
16 Cautionary notes (if any). Information on particular features (to be read before using chart)
17 Reference to an adjoining chart of similar scale
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Nautical Chart Symbols, Abbreviations and Terms
Positions, Distances, Directions, Compass
Geographic Positions
NOS National Ocean Service (US)
NIMA National Imagery and Mapping Agency (US)
IHO International Hydrographic Organization
NOS/NIMA IHO
Lat Latitude Lat
Long Longitude Long
° Degree(s) °
' Minute(s) of arc '
" Second(s) of arc "
PA Position approximate PA
PD Position doubtful PD
N North, Northern N
E East, Eastern E
S South, Southern S
W West, Western W
NE Northeast NE
SE Southeast SE
NW Northwest NW
SW Southwest SW
Control Points
NOS/NIMA IHO/Foreign NIMA Charts
Triangulation point
Observation spot
Fixed point
Benchmark
Boundary mark
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Nautical Chart Symbols, Abbreviations and Terms
Symbolized Positions (Examples)
NOS/NIMA IHO/Foreign NIMA Charts
Symbols in plan:
position is center
of primary
symbol
Symbols in
profile: position is
at bottom of
symbol
Point symbols
(accurate
positions)
Approximate
position
Units
Foreign
NOS/NIMA IHO NIMA
Charts
km Kilometer(s) km
m Meter(s) m
dm Decimeter(s) dm
cm Centimeter(s) cm
mm Millimeter(s) mm
M, Mi, NMi, NM Nautical mile(s) (1852m) or sea mile(s) M
cbl Cable(s) length
ft Foot/feet ft
fm, fms Fathom(s)
h, hr Hour h
m, min Minute(s) of time m min
s, sec Second(s) of time s sec
kn Knot(s) kn
t Ton(s) (metric ton equals 2,204.6 lbs) t
cd Candela (new candle) cd
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Nautical Chart Symbols, Abbreviations and Terms
Magnetic Compass
NOS/NIMA IHO/Foreign NIMA Charts
var, VAR Variation
mag magnetic
brg Bearing
T true
dev Deviation
Note of magnetic variation,
in position
Note of magnetic variation,
out of position
Compass Roses, Isogonic Lines, Local Magnetic Disturbance
Compass rose, normal pattern (smaller patterns of compass rose may be
used)
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Nautical Chart Symbols, Abbreviations and Terms
True North compass rose
Isogonic lines
Local magnetic disturbance.
Within the enclosed area, the
magnetic variation may deviate
from the normal by the value
shown.
Local magnetic disturbance.
Where the area affected cannot
be easily defined, a legend only
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Nautical Chart Symbols, Abbreviations and Terms
Supplementary National Symbols
NOS/NIMA
m² Square meter
m³ Cubic meter
in, ins Inch(es)
yd, yds Yards
St M, St Mi Statute mile
µsec, µs Microsecond
Hz Hertz
kHz Kilohertz
MHz Megahertz
cps, c/s Cycles per second
kc Kilocycle
Mc Megacycle
Ton (U.S. short ton equals
T
2,000 lbs.)
deg Degree(s)
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Nautical Chart Symbols, Abbreviations and Terms
Natural Features
Coastline
NOS National Ocean Service (US)
NIMA National Imagery and Mapping Agency (US)
IHO International Hydrographic Organization
Foreign NIMA
NOS/NIMA IHO
Charts
Coastline,
surveyed
Coastline,
unsurveyed
Steep coast,
Steep coast
with rock
cliffs, Cliffs
Coastal
hillocks,
elevation not
determined
Flat coast
Sandy shore
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Description:the area affected cannot be easily defined, a legend only . vertical clearance. Pipeline on land .. submarine cable. Submarine Pipelines. NOS.
