Specialized GIS software (e.g., QGIS with plugins) or Marine Chart Plotters.
: Because this data is used for critical navigation and may involve sensitive national bathymetry, these ZIP files are usually not publicly available for direct download. They are typically distributed by authorized hydrographic offices (such as the Korea Hydrographic and Oceanographic Agency ) to licensed vessel operators, maritime researchers, or government contractors. Download and Installation Summary Primary Source Download KDS HAC TNK zip
Official National Hydrographic Portals or ECDIS Manufacturers. Compressed ZIP file containing .HAC and .TNK extensions. Application Specialized GIS software (e
: Downloading these files from unofficial "free" mirrors is highly discouraged as they may contain outdated navigation data that is unsafe for actual sea voyages or contain malicious software targeting industrial systems. Specialized GIS software (e.g.