Ship Observation Code

Front 1

BBXX

Back 1

Indicator for weather report

Front 2

iR

Back 2

Precipitation Data Indicator

Front 3

N

Back 3

Fraction of the sky coveredd by clouds of all types

Front 4

D....D

Back 4

Ships radio call sign or ICAO

Front 5

iX

Back 5

Weather Data Indicator

Front 6

YY

Back 6

Day of the month

Front 7

h

Back 7

Base height of the lowest cloud

Front 8

dd

Back 8

True Direction

Front 9

GG

Back 9

Actual time of observation to the nearest whole hour in ZULU

Front 10

iW

Back 10

Wind indicator

Front 11

VV

Back 11

Visibility

Front 12

ff

Back 12

Wind speed in knots

Front 13

fff

Back 13

Winds over 99kts

Front 14

99

Back 14

Indicator for ships position groups

Front 15

LaLaLa

Back 15

Latitude in Degrees and tenths

Front 16

Qc

Back 16

Quadrant of the globe

Front 17

LoLoLoLo

Back 17

Longitude in degrees and tenths

Front 18

Sn

Back 18

Sign of Temperature in Celsius

Front 19

TTT

Back 19

Dry Bulb Temperature in degrees Celsius

Front 20

TdTdTd

Back 20

Dew Point Temperature in Degrees Celsius

Front 21

ww

Back 21

Present Weather

Front 22

PPPP

Back 22

Sea Level Pressure in Millibars and tenths

Front 23

a

Back 23

Three hour pressure tendency

Front 24

ppp

Back 24

Amount of pressure tendency in the three hours preceding the time of observation

Front 25

W1 and W2

Back 25

Past Weather

Front 26

cH

Back 26

High Clouds

Front 27

Nh

Back 27

The amount of sky covered by low clouds, if there are no low clouds, use the amount of sky covered by mid clouds.

Front 28

cL

Back 28

Low Clouds

Front 29

cM

Back 29

Mid Clouds

Front 30

Ds

Back 30

Ships Direction over the last thee hours

Front 31

Vs

Back 31

Ships average speed

Front 32

Dw1Dw1Dw2Dw1

Back 32

True direction in tenths of degrees, from which the swell waves are coming

Front 33

HwHw, Hw1Hw1, Hw2Hw2

Back 33

Height of the primary and secondary sea waves

Front 34

Is

Back 34

Cause of Ice Accretion

Front 35

EsEs

Back 35

Thickness of ice Accretion in centimeters

Front 36

Rs

Back 36

Rate of Ice accretion on ships

Front 37

Sw

Back 37

Sign and type of wet bulb temperature

Front 38

TbTbTb

Back 38

Wet bulb temperature in Degrees and tenths celsius

Front 39

PwPw, Pw1Pw1, Pw2Pw2

Back 39

Period of the waves in seconds

Front 40

TwTwTw

Back 40

Sea Surface temperature

Front 41

Ci

Back 41

Concentration or arrangement of sea ice

Front 42

Si

Back 42

Stage of development of sea ice

Front 43

Di

Back 43

Bearing of principal ice edge

Front 44

bi

Back 44

Ice of land origin

Front 45

zi

Back 45

Present ice situation and trend over preceding 3 hours