| NOS | NIMA | |
IHO | Foreign NIMA Charts |
|---|---|---|---|---|
| Firing danger area |
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Military area, entry prohibited |
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| Mine-laying practice area |
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| Submarine transit lane and exercise area |
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| Mine field |
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| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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