I>Electronic navigation chart:
There are two types of electronic chart: raster charts and vector charts
1> Raster chart
ARCS charts are exact digital copies of the world-leading BA paper charts. All ARCS charts have the same familiar appearance and use the same internationally recognised symbology as the Admiralty paper chart series. This familiarity, combined with accurate satellite positioning in an ECS or ECDIS navigation system, improves situational awareness and helps crews to understand critical information at moments of peak workload and pressure. And this brings confidence and calm to the bridge.
RNCs have the following attributes:
- RNCs are a facsimile of official paper charts
- RNCs are produced according to the international standards set by the IHO
- RNCs are regularly updated with official update information. This is distributed digitally
With over 3,000 official charts available, ARCS provides extensive raster chartcoverage of international shipping routes, main ports and harbours in acomprehensive range of scales.By combining the wide coverage, familiarity and ease-of-use of ARCS with AVCS, you get the most comprehensive and trusted digital chart service available for ships trading internationally.
ENC is a database of all the objects (points, lines, areas, etc.) represented on a chart and standardized content, structure and form issued together with ECDIS use from the state authorities, the jurisdiction of the Department of Water. ENC containing all useful information for maritime safety and may contain extra information is usually indicated on the paper are considered necessary for maritime safety.
ENC using a device approved ECDIS and certification along with additional equipment to store (back up) is a unique method to navigation in an era without paper charts.
ENCs have the following attributes:
- ENCS content is based on source survey data from the relevant hydrographic offices or the data shown in the official paper charts
- ENCs are compiled and encoded according to the international standards set by the IHO
- Positions on ENCs are referred to the World Geodetic System 1984 Datum (WGS84). This is directly compatible with GNSS positions
- ENCs are issued only by or on the authority of of a Government, authorized Hydrographic Office or other relevant government institutions
- ENCs are regularly updated with official update information that is normally distributed digitally