3. ECDIS Screen
3-2
3.2 Electronic Chart Area
The ECDIS can use the following types of charts:
• S57ed3 ENC charts (vector)
• CM-93 charts (vector)
• ARCS charts (raster)
The following information can also be displayed:
• Cursor (moved by trackball)
• Planned route
• EBL (Electronic Bearing Line) and VRM
• Own ship symbol with speed vector
3.2.1 Electronic charts in ECDIS
The electronic navigational charts are displayed in the electronic chart area. There are two kinds of electronic
navigational charts available for use in the ECDIS:
• S57ed3 ENC or CM-93 vector format
• ARCS raster format
Official paper charts may be replaced with S57ed3 ENC and ARCS charts. The user should check the current
situation in his or her flag country administration and if in doubt use the paper charts as the primary source of
navigational information.
The ECDIS combines chart and navigational information. It should be noted that modern navigation systems (e.g.,
differential GPS) may offer more accurate positioning than what was used 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 charts. From this format the ECDIS generates the “system
ENC”, = SENC, which is used for actual operations of the ECDIS.
When opening a chart it is displayed with the default scale called the compilation scale. The details for the chart are
displayed in the electronic chart area and these can be modified. You can change the chart scale with the ZOOM IN
and ZOOM OUT functions, and the 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 a 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
for paper charts under any condition. To emphasize this point these charts are called “Non-HO” charts in this
manual.
To Next Page
Loading...
