| NOS | NIMA | |
IHO | Foreign NIMA Charts |
|---|---|---|---|---|
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Radar Surveillance Station |
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| Radar range |
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| Radar reference line |
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| Radar reference line coinciding with a leading line |
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| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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