Definition
Administered by IALA, the system standardises the shape, colour, topmark, retroreflector and light rhythm of floating and fixed marks. It comprises six mark types: lateral, cardinal, isolated danger, safe water, special, and emergency wreck marking. Only the lateral convention differs geographically, splitting the world into Region A and Region B. All other mark types carry identical meaning everywhere, so a cardinal or isolated danger mark can be read without first knowing which region you are in.
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