*Isolated danger buoy.

The isolated dangerous goods sign is set up or moored on top of the isolated dangerous substance, or as close as possible to the dangerous substance, indicating the location of the isolated dangerous substance. Ships should refer to nautical data and avoid navigation of this standard. please check the picture below:

The features of isolated danger buoy.

* Safe water buoy.

Safe water signs are used to indicate navigable waters all around, can be used to mark the center of the channel or the middle line of the channel, and can also be used to mark the estury of the channel, the port, sea estuary and land.

The features of safe water buoy.

*Special mark buoy.

A special mark is a mark used to indicate a specific water or the characteristics of water.

The features of special mark buoy.

The special marks are mainly used to mark the following 8 types of water by application:

1) Anchorage ground: ship berthing and quarantine anchorage, etc.

2) Restricted navigation zones:  military exercise zones, no-navigation waters, etc.

3) Offshore operation area: marine data detection, hydrographic survey, diving, salvage, marine development, mud throwing area, speed measurement field, compass correction field, etc.

4) Traffic separation: Traffic separation areas, dividers, etc., it can be used when using regular navigational aids to indicate that parting lanes may cause confusion.

5) In-water structures: offshore wind farms, cables, pipelines, inlets, outlets, etc.

6) Entertainment area: sports training area, sea casino, etc.

7) Aquatic product operation area: aquatic product fixed net operation area and aquaculture farm, etc

8) Crossing area: the area where the ship crosses the channel, etc

The special mark should be marked with a mark indicating its purpose where the subject is conspicuous, and should be visible when viewed from any horizontal direction on the water.

Please check the specific rules about special marks:

* New dangers Marks.

a, Methods for marking new dangerous substances.

1) When the navigation authority believes that a new dangerous substance endangers the safety of the ship's navigation, it shall set up a sign. Side signs, orientation signs, and isolated hazard signs can be used for marking; Emergency shipwreck markers can also be used when marking new shipwrecks and sunken objects.

2) When using side signs to mark dangerous objects, the light rhythm should be continuous flashing. If the navigation authority considers that the navigational risk is very high, it shall set up at least one repeating sign, the whole characteristics of which shall be the same as the sign paired with it.

3) New hazards can be marked with radar transponders. Its coded bit Moscow signal "D"(— ● ● ) can also be marked by other radio beacons, such as physical AIS beacons and virtual AIS beacons.

4) In the case that it is not appropriate or possible to set up physical navigational aids in time, virtual AIS navigation signs can be used separately for marking.

b, Removal of new hazard markers.

The navigation authority may remove the new hazard mark after confirming that the information on the new hazard markers  has been fully notified or that the new hazard markers have been eliminated.

c, Indicating the position of the emergency shipwreck.

Emergency shipwreck indicators should be set or moored on new shipwrecks or sunkens, or as close as possible to new shipwrecks and sunkens. And mark the location of the new shipwreck and the wreck. Ships should refer to nautical data and avoid navigation of this standard. please check the picture below:

d, The features of Emergency position marker for sunken ship.