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28 · ECDIS Screen
Electronic chart area
The ECDIS can use the following types of charts:
· S57ed3 ENC charts (vector)
· CM-93 charts (vector)
· ARCS charts (raster)
There can also be displayed following information:
· cursor moved by trackball
· planned route
· EBL (Electronic Bearing Line) and VRM
· symbol of ownship with speed vector
· targets acquired by ARPA
Electronic charts in ECDIS
The electronic navigational charts are displayed in Electronic chart area. There are two kinds of electronic
navigational charts available to use in the ECDIS:
· S57ed3 ENC or CM-93 vector format
· ARCS raster format
S57ed3 ENC and ARCS electronic charts may substitute official paper charts. User should check the current
situation from his flag country administration and if in doubt use the paper charts as primary source of navigational
information.
ECDIS combines chart and navigational information. It should be noted that modern navigation systems (e.g.,
differential GPS) may offer a more accurate positioning than was available to position some of the surveys from
which the electronic navigational chart was derived.
S57 vector format:
ECDIS is compatible with S57 release 3 ENC format. From this format the ECDIS generates the “System ENC”, =
SENC, which is used for actually for operations the ECDIS.
When opening a chart it is displayed with default scale called compilation scale. It is possible to modify details of
chart displayed in Electronic chart area. You can change scale of chart by pressing ZOOM IN and ZOOM OUT
pushbuttons. Scale range is 1:1 000 - 1:50 000 000.
CM-93:
Compatibility with CM-93 format depends on commercial agreements. Some versions of this ECDIS are compatible
and others are not. The compatibility is controlled by the security device called dongle. From CM-93 format the
ECDIS generates SENC which is used for actual operations of the ECDIS. The difference between S57ed3 ENC
charts and CM-93 charts is that the CM-93 charts are from a private source and they cannot be used as a substitute of
paper chart under any condition. To highlight that part they are later called as NON-HO charts in this manual.