| NOS/NIMA | |
IHO | Foreign NIMA Charts |
|---|---|---|---|
 |
Canal |
 |
 |
 |
Lock (on large-scale charts) |
 |
|
 |
Lock (on smaller-scale charts) |
 |
 |
| Caisson |
 |
||
| Flood barrage |
 |
||
 |
Dam |
 |
 |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
|
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