Abstract:AHO ENC Online is a geospatial web service that provides a dynamically drawn visualisation of the official AusENC catalog. It makes ENC datasets issued by the Australian Hydrographic Office (AHO) available for display using the S-52 presentation library specification. WARNING: This service is not certified for navigation. It is not an official navigational chart and must not be used for navigation or any related operational decision-making. It is designed to support shore-based maritime awareness and analysis. The Australian Hydrographic Office (AHO) makes best efforts to update the data within this geospatial service weekly. These updates aim to align with the weekly release of the official AusENC service. AHO ENC Online can be integrated into various Geographic Information Systems (GIS) and web applications that support RESTful and OGC services. The AusENC catalog provides chart coverage for the waters of Australia, the Australian Antarctic Territory and Timor Leste ('AU' cells), Papua New Guinea ('PG' cells), and Solomon Islands ('SB' cells). Australian Hydrographic Office © Commonwealth of Australia 2025 - https://www.defence.gov.au/copyright