| NOS/NIMA | IHO/Foreign NIMA Charts | |
|---|---|---|
 |
Triangulation point |
 |
 |
Observation spot |
 |
 |
Fixed point |
 |
 |
Benchmark |
 |
 |
Boundary mark |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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