| NOS/NIMA | IHO/Foreign NIMA Charts | |
|---|---|---|
| var, VAR | Variation | |
| mag | magnetic | |
| brg | Bearing | |
| T | true | |
| dev | Deviation | |
| Note of magnetic variation, in position |
 |
|
| Note of magnetic variation, out of position |
 |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
|
|
||||||||||||||||||||||||
|
|||||||||||||||||||||||||
|
|
||||||||||||||||||||||||