20231120 22144500 1.0 TRUE Navigation Aids DoT (DOT-004) Western Australia uses an internationally recognised uniform coding system of navigation marks known as the IALA buoyage system A. Navigation marks are the equivalent of road signs on highways. License: Creative Commons Attribution Tags: beacon, buoy, marine, marker, navigation, navigation-aid, network, river, transport, wa Contact: Steven.Hearn@transport.wa.gov.au Department of Transport (WA)