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Alpha Flag, International Diver Down
The blue Alpha Flag is required by federal law to be displayed by vessels engaged in diving operations. With either flag, boaters should exercise caution. |
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Diver Down
The red Divers Flag is not an official flag but is used widely by recreational divers. |
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Boats Keep Out
Nature of danger may be placed outside crossed diamond (e.g. waterfalls, swim areas, rapids). |
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Caution Controlled
Area as indicated in circle (e.g. speed limit, no fishing, no anchoring, ski only, slow, no wake, no ski, no prop boats). |
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Channel Marker
Left Lateral System. Keep buoy on left facing upstream. |
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Lateral System.
Keep buoy on right facing upstream. |
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Danger
Nature of danger may be indicated inside the diamond shape (e.g. rocks, reefs, dams, construction, snags). |
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Destruction
Cardinal Buoyage Marking System. Do not pass between shore and buoy. |
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Information
Tells direction and distances to locations, food, repairs, supplies and other non-regulatory messages. |
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Mooring Buoy
White with reflecting blue band. May have white light or reflector. |