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The International Association of Maritime Aids and Lighthouse Authorities (IALA) defines seven categories of navigational buoys used to mark channels, hazards, and safe water.0:18 Lateral marks indicate the port and starboard sides of a channel, with Region A (including the UK) using red to port and green to starboard when entering a harbor, while Region B (including the USA and Japan) reverses these colors.4:23 Cardinal marks—North, South, East, and West—use yellow and black coloring, specific top-mark cone configurations, and white light sequences based on a clock face to indicate the safe side of a hazard.13:45 Isolated danger marks feature red and black horizontal stripes with two black spheres as a top mark.16:01 Safe water marks, identified by red and white vertical stripes and a spherical top mark, indicate the entrance to a channel.11:39 Special marks are yellow with an X-shaped top mark, denoting areas like racing zones or pipelines.12:42 Sectored lights provide directional guidance by displaying different colors depending on the vessel's bearing.19:17

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