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Buoys

6 types of sea buoys used in maritime pilotage to aid in your sailing navigation, defined by International Association of Lighthouse Authorities (IALA)

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Cardinal Marks Named after the cardinal parts of the compass, they indicate the position of a danger
Direction of Buoyage Identified on charts, the direction of buoyage helps prevent collisions at sea by clearly providing the direction vessels should be travelling in
Emergency Wreck Buoys Placed above, or as close to, new wrecks and underwater hazards
IALA Buoyage Systems The International Association of Lighthouse Authorities (IALA) that standardised the world's navigational buoys into two systems
Isolated Danger Buoys Placed directly above a hazard such as a submerged rock or a wreck, but has navigable water all around it
Lateral Marks Define the edges of a navigable channel, most commonly when entering/leaving harbours
Preferred Channel Markers Used when there's 2 different navigable channels available, they are placed at the split of channels to identify which is the preferred channel
Safe Water Markers Sailing buoy, identifies that safe, navigable water is all around
Special Marks Indicate special areas or features such as military exercise zones, recreation zones, traffic separators etc