9-1
9. Raster Chart Material
9.1 ARCS Charts
Approximately 2,700 ARCS charts are available on 11 chart CD-ROMs, covering the world's major trading routes
and ports. Regionally based chart CD-ROMs RC1 to RC10 contain standard BA navigation charts, while RC11
contains ocean charts at scales of 1:3,500,000 and smaller. ARCS charts are facsimile copies of BA paper charts,
and as such share a common numbering system. New editions and new charts for ARCS and BA paper charts are
issued simultaneously. They are supplied on each Weekly Update CD-ROM until incorporated into the chart
CD-ROMs at the next issue.
Occasionally, it is necessary to issue new charts in advance of their intended date of validity, for example a change
in regulations commencing on a future date. In such cases the current chart will co-exist with the new chart until the
date of implementation, the earlier chart having the suffix "X" after the chart number. The system will allow access
to both charts for the period of overlap by issue of new chart permits.
Sometimes you may wish to manually add Notices to Mariners or Navtex warnings into your ARCS charts. In this
system this is called Manual Updates. Manual updates are valid for both ARCS and S57 charts so that you need to
define them only once. Further, manual updates are valid for all scales so that you don't need to repeat them for
charts published in different scales from the same area. For details, see Chapter 10 "Manual Updates".
9.1.1 Chart legend of ARCS chart
The chart legend provides information about edition date and updates of the displayed ARCS chart. To toggle the
legend ON/OFF, put the cursor in the sidebar area, confirm that "Select Sidebar" appears in the mouse functions
area then push the right mouse button. Then, select Chart Legend from the menu and push the scrollwheel to open or
close the ARCS chart legend.
Chart Number: Number of current chart is shown in this
field.
Country Of Origin: The country that produced the original
chart.
Latest NM: Date of the latest Notice to Mariners included in
the chart.
Edition Date: Date when the chart was issued.
Publication Date: Issue date of Update CD-ROM used to
update the system.
WGS shift status: Datum shift between local datum and WGS-
84 datum is known (=Defined), unknown, operator defined
(=Undefined) or shift is known only some parts of chart
(=Partially defined).
Depth: Unit of depth measurement.
Height: Unit used for indication of height above sea level (for
example, clearance height).
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