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Nature of the Seabed

SNS a-e

Ref.	IHO Symbology	Description	CHS Symbology
1	S	Sand	S † s
2	M	Mud	M † m
3	Cy	Clay	Cy † Cl † cl
4	Si	Silt	Si † Oz † oz
5	St	Stones	St † st
6	G	Gravel	G † g
7	P	Pebbles	P † peb
8	Cb	Cobbles
9.1	R	Rock, Rocky	R † r † Rk † Rky † Sn † shin
9.2	Bo	Boulders	Bo † B † b † Blds
10	Co	Coral and Coralline algae	Co † crl
11	Sh	Shells (skeletal remains)	Sh † Oy † Oys † oys † sh † Ms † mus
12.1	S/M	Two layers, e.g. sand over mud
12.2	fS.M.Sh fSMSh	Mixed qualities, e.g. fine sand with mud and shells	fSMSh
13.1	Wd	Weed (including kelp)
13.2		Kelp, weed
14		Sandwaves
15		Spring in seabed