Upon re-entry into coastal waters from the open ocean, a mariner frequently encounters specific markers designed to aid in safe passage. These aids to navigation (ATONs) are strategically placed to indicate channels, hazards, and other relevant information. One type of ATON uses color and shape to convey information about navigable waterways. Specifically, a buoy of a particular color alerts mariners to the position of the channel relative to their vessel. For example, vessels often pass these markers on a specified side depending on their direction of travel.
The presence of such a marker is critical for preventing groundings, collisions, and other maritime accidents. Historically, these aids have evolved from simple natural features to sophisticated, electronically enhanced devices. Their placement and maintenance are vital to maintaining the safety and efficiency of maritime commerce and recreational boating. Understanding the system used to categorize these markers is essential for all navigators.
