Updating enc charts
An ENC is a vector chart that contains all the information necessary for safe navigation.
These electronic charts are produced according to the International Hydrographic Organization (IHO) standards for the exchange of digital chart information (S57).
In Norway, Kartverket is the authorized charting authority.
ECDIS is a navigation information system that complies with the requirements set by the International Maritime Organization (IMO).
Manufacturers of electronic charts for chartplotters often add practical information that may be useful to the recreational user, or information of a more commercial nature.
Some of the information provided by the Mapping Authority may also have been removed for various reasons.
Manufacturers of electronic charts for chart plotters purchase their data from the Mapping Authority, either official ENCs or digital versions of paper charts.When used with an approved backup system, it is considered a legal replacement for paper charts – if the data is prepared in accordance with the stipulated requirement specifications (S57 ENC Product Specification). The Electronic Chart System (ECS) is a common term for chart systems that do not comply with the "IMO Performance Standards".Such systems will not satisfy the requirements related to navigational charts on board vessels as defined in SOLAS Chapter V (International Convention for the Safety of Life at Sea).The Norwegian Mapping Authority is responsible for producing and updating the country's official electronic navigational charts (ENCs).ENCs are primarily aimed at professional navigators.
See an overview of suppliers offering electronic charts to chartplotters, based on chart data from the Mapping Authority, and how often they update their charts.