| NOS/NIMA | |
IHO/Foreign NIMA Charts |
|---|---|---|
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Swept channel | |
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Swept area, not adequately sounded (shown by purple or green tint) | |
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Stream |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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