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Excerpt taken from: WMO No. 386 Manual on the Global Telecommunication System
Part II - Operational Procedures for the GTS
ATTACHMENT II–5 - DATA DESIGNATORS T1T2A1A2ii IN ABBREVIATED HEADINGS

TABLE D1

Level designator ii (when T1 = O)

Instructions for the proper application of level designators for ocean depths 

(1) 
The designators specified in this table should be used to the greatest extent possible to indicate the levels below the ocean surface in the body of the GRIB bulletin for oceanographic products.

 

T1
Level Designator
ii
Depth (in meters)
O
98
 Surface
O
96
 2.5 m
O
94
 5.0 m
O
92
 7.5 m
O
90
 12.5 m
O
88
 17.5 m
O
86
 25.0 m
O
84
 32.5 m
O
82
 40.0 m
O
80
 50.0 m
O
78
 62.5 m
O
76
 75.0 m
O
74
 100 m
O
72
 125 m
O
70
 150 m
O
68
 200 m
O
66
 300 m
O
64
 400 m
O
62
 500 m
O
60
 600 m
O
58
 700 m
O
56
 800 m
O
54
 900 m
O
52
 1000 m
O
50
 1100 m
O
48
 1200 m
O
46
 1300 m
O
44
 1400 m
O
42
 1500 m
O
40
 1750 m
O
38
 2000 m
O
36
 2500 m
O
34
 3000 m
O
32
 4000m
O
30
 5000m
O
01
 Primary layer depth

 

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Telecommunications
Abbreaviated Heading
TTAAii CCCC
Symbolic Structure explained
Table Definitions
Table A
Table B1
Table B2
Table B3
Table B4
Table B5
Table B6
Table C1
Table C2
Table C3
Table C4
Table C5
Table C6
Table C7
Table D1
Table D2
Table D3
Indicator BBB

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