International Association Of Lighthouse Authorities

• Lateral marks - indicate the edges of a channel
• Cardinal marks - indicate the direction of safe water at a dangerous spot
• Safe water marks - indicate the deep water and open end of a channel
• Special marks - indicate administrative areas, such as, speed restrictions or water sking areas
• Isolated danger marks - indicate a hazard to shipping

See also

• International Hydrographic Organization
• Homepage of IALA http://www.iala-aism.org

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