ENCgegevens

ENCgegevens is a Dutch term referring to the digital information contained in Electronic Navigational Charts (ENCs) used in marine navigation. ENCs are vector chart datasets produced by hydrographic offices and other authorized bodies to support safe navigation aboard ships equipped with electronic chart display and information systems (ECDIS). An ENC consists of geometric features and associated attributes that describe coastlines, depths, hazards, navigational aids, traffic separation schemes, restricted areas, port facilities, and other information essential for route planning and situational awareness.

ENCgegevens are standardized to ensure interoperability. The IHO publishes standards such as S-57 for legacy ENCs and S-101 for the modern, more feature-rich ENCs. Data are provided with metadata including geographic coverage, data source, date of issue, edition, and the data quality. Updates are distributed through national hydrographic offices and commercial providers, and ships are expected to keep ENCs up to date via notices to mariners and regular updates.

Usage: In ECDIS, ENCgegevens are used for display, planning, and risk assessment. They can be layered with other datasets, such as radar overlays or AIS data. ENCs are different from raster charts: ENCs are vector graphics that render based on scale and user settings, with features selectable and searchable.

Licensing and access: ENCgegevens are typically subject to licensing agreements. Some regions offer open ENC data under certain conditions; others require subscription. Compliance with SOLAS and IHO standards is maintained by flag states and port authorities.

Quality and limitations: The accuracy depends on data source, update frequency, and calibration. Non-compliant or outdated ENCgegevens can reduce navigational safety, thus adherence to latest editions and notices is critical.