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68 · Vector Chart material
Chart material will be available stored in media such as CD-ROMs and floppies or electronically from LAN (Local
Area Network) in which it could have arrived from RENCs, CD-ROMs or floppies. Such material can contain only
basic cells, cells and updates or only updates. This Electronic Chart System contains as standard delivery the
software to access CD-ROMs, floppies and LAN.
Each S57 chart may contain beside the chart itself links to additional textual descriptions or pictures. Typically
additional textual descriptions and pictures contain important sailing directions, tidal tables and other traditional
paper chart features, which do not have any other method to be included into the S57 chart. This ECDIS copies
these textual descriptions and pictures into its hard disk and allow you as user to cursor pick them for viewing
purposes.
An appendix of this manual provides short introduction for interpretation of S57 ENC chart display.
Definitions of terms
Cell
A cell is a geographical area containing ENC data. Each cell has separate unique name.
Hydrographic Offices divide their responsibility area into the cells which they publish.
S57 chart
A database, standartized as to content, structure and format, issued for use with ECDIS without
any authority of government authorized Hydrographic Office. The difference of S57 chart and
ENC is that non-ENC charts require complete up-to-date paper charts to be used as primary aid
of navigation.
ENC
A database, standartized as to content, structure and format, issued for use with ECDIS on the
authority of government authorized Hydrographic Offices. The ENC contains all the chart
information necessary for safe navigation and may contain supplementary information in
addition to that contained in the paper chart (e.g. sailing directions) which may be considered
necessary for safe navigation. The name of coding standard for ENC is S57ed3.
SENC
A database resulting from the transformation of the ENC by ECDIS for appropriate use,
updates to the ENC by appropriate means, and other data added by the mariner. It is this
database that is actually accessed by ECDIS for the display generation and other navigational
functions, and is the equivalent to an up-to-date paper chart. The SENC may also contain
information from other sources.
RENC
A service provider offering ENC delivery and update service as defined in IHO standard
S52e3. Often a RENC provides CD-ROM based service to ECDIS users. One example of a
RENC is the RENC in Stavanger operating under marketing name PRIMAR-Stavanger.