nature of seabed

Types of Seabed, Intertidal Areas

NOS/NIMA
 		 IHO/Foreign NIMA Charts
    S Sand     S
    M Mud     M
    Cy; Cl Clay     Cy
    Si Silt     Si
    St Stones     St
    G Gravel     G
    P Pebbles     P
    Cb Cobbles     Cb
    Rk; rky Rock; Rocky     Rk
    Co Coral and Coralline algae     Co
    Sh Shells     Sh
    S/M Two layers (shown here: sand over mud)     S/M
    Wd Weed (including Kelp)     Wd
click for larger image Kelp, Seaweed click for larger image
click for larger image Mobile bottom (sand waves) click for larger image
click for larger image Freshwater springs in seabed click for larger image
click for larger image Area with stones, gravel or shingle click for larger image
click for larger image Rocky area, which covers and uncovers click for larger image
click for larger image Coral reef, which covers and uncovers click for larger image