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international buoyage systems
cardinal system
lateral system
international chart symbols
US chart abbreviations
ATON abbreviations
US bridge lighting
Uniform Waterway (USWMS)
US dayboards


international buoyage & charts

 
IALA system 'A'
   
 
IALA system 'B'

Unlike Aviation, marine navigational systems are not standardised world-wide. Whilst the cardinal system is universal, the lateral system is divided into two regions, the Americas and the rest of the world. Most countries operate with the port (red) buoys showing on the left hand side when  entering a channel with an incoming tide. In the Americas, the system is reversed.