Chart 1 Symbols, Abbreviations and Terms Used on Charts

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Nature of the Seabed - Section J

SNS a-e

Types of Seabed

Ref. IHO Symbology Description CHS Symbology
1 Sand
2 Mud
3 Clay
4 Silt
5 Stones
6 Gravel
7 Pebbles
8 Cobbles
9.1 Rock, Rocky
9.2 Boulders
10 Coral and Coralline algae
11 Shells (skeletal remains)
12.1 Two layers, e.g. sand over mud
12.2 Mixed qualities, e.g. fine sand with mud and shells
13.1 Weed (including kelp)
13.2 Kelp, weed
13.3 Seagrass (where distinguished from weed)
14 Sandwaves
15 Spring in seabed
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