Raytheon Pathfinder ECDIS, Руководство оператора, Страница: 28 / 370

Operator Manual
1 − 4
3655DOC020102 Edition: 30.MAR.2007
• RENCs do not deliver ENCs directly to ships. RENC customers are
commercial chart data distributors who
− in analogy to paper chart
distribution − tailor individual sets of chart data for the special needs of a
shipping company or a particular ship.
To date, two RENCs − Primar Stavanger, based in Norway and IC − ENC, based
in the United Kingdom, are in operation. However, it has to be noted, that the
WEND concept has not been fully adopted through all ENC producing nations
yet. A number of nations are still distributing their ENCs individually (e.g. Japan
Hydrographic Office, Australian Hydrographic Office, USA
− NOAA) either
through chart data suppliers or directly.
Principally, WEND focuses on the supply and distribution of ENCs by facilitating
the
establishment of services intended to satisfy the SOLAS carriage requirement
for up
− to − date charts. Within this primary purpose, ENCs are to be distributed in
the encapsulation described in the S57 Standard. However, such “plain“ S57 en-
capsulated ENCs may become easily subject to unauthorized amendment or ille-
gal copying.
IHO has therefore issued the special publication S − 63 “IHO Data Protection
Scheme“ as Standard for protection of ENCs by encryption.
Encryption is a complex technical procedure:S
− 63 defines security constructs
and operating procedures for the RENCs/chart data distributors and provides
specifications that allow navigation equipment manufacturers to build S
− 63 com-
pliant ECDIS. S − 63 is already in use for ENC distribution and is supported by the
noted two RENCs. Most major ECDIS manufacturers have implemented decryp-
tion procedures in conformance with S
− 63 within their systems.
1.1.3 Charting Capabilities for ARCS Chart Types
ARCS Seacharts (Raster − data − format)
ARCS means Admiralty Raster Chart Service. This institution scans seacharts of
the British Admiralty (BA) in a raster
− data − format. Such a manner scanned sea-
charts are available on CD − ROM as Raster Nautical Charts (RNCs) with a
worldwide coverage.