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Nature of the Seabed

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
14
Sandwaves
15
Spring in seabed