For the purpose of these performance standards:
2.1
Electronic chart display and information
system (ECDIS) means a navigation information system which,
with adequate back-up arrangements, can be accepted as complying with
the up-to-date chart required by regulation
V/20 of the 1974 SOLAS Convention, by displaying selected information
from a system electronic navigational chart (SENC) with positional
information from navigation sensors to assist the mariner in route
planning and route monitoring, and by displaying additional navigation-related
information if required.
2.2
Electronic navigational chart (ENC) means
the database, standardized 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.
2.3
System electronic navigational chart
(SENC) means 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.
2.4
Standard display means the SENC
information that should be shown when a chart is first displayed on
ECDIS. The level of the information it provides for route planning
or route monitoring may be modified by the mariner according to the
mariner’s needs.
2.5
Display base means the level
of SENC information which cannot be removed from the display, consisting
of information which is required at all times in all geographical
areas and all circumstances. It is not intended to be sufficient for
safe navigation.
2.6 Further information on ECDIS definitions may
be found in IHO Special Publication S-52, appendix 3 (see appendix 1).