AusENC - AHO ENC Numbering System

Official Electronic Navigation Charts (ENC) produced by the Australian Hydrographic Office (AHO) follow a simple grid-based location system, while those covering ports often combine the coverage only obtainable by using several Paper Nautical Charts (PNC).

All ENC must adhere to an eight-character file numbering convention controlled by the International Hydrographic Organization (IHO). This factsheet explains the six differing levels of detail available within the AusENC service and the file numbering system that identifies where they are located.