| NOS/NIMA | |
IHO/Foreign NIMA Charts |
|---|---|---|
| f; fne | fine medium (only used in relation to sand) coarse |
f |
| m | m | |
| c; crs | c | |
| bk; brk | broken | bk |
| sy; stk | sticky | sy |
| so; sft | soft | so |
| stf | stiff | sf |
| Vol | volcanic | v |
| Ca | calcareous | ca |
| h; hrd | hard | h |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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