| NOS | |
|---|---|
 |
Bell (on land) |
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Marine police station |
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Fireboat station |
 |
Notice board |
 |
Lookout station; Watch tower |
 |
Semaphore |
 |
Park Ranger station |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
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