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 Kelp, Seaweed Mobile bottom (sand waves) Freshwater springs in seabed Area with stones, gravel or shingle Rocky area, which covers and uncovers Coral reef, which covers and uncovers