Electronic Chart Area; Electronic Charts In Ecdis - Furuno FEA-2807 Operator's Manual

3. ECDIS Display
3.2

Electronic Chart Area

The ECDIS can use the following types of charts:
•
S-57 (IHO)
•
S-63 (IHO)
•
ARCS (UK-HO)
•
CM-ENC (C-MAP)
•
CM-93/2 (C-MAP)
•
CM-93/3 (C-MAP)
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
•
TT-acquired target
•
AIS target
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 operator 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. ENC charts are converted to SENC for use with
ECDIS.
When you open 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. A security device called a dongle controls the compatibility. From CM-93 format the
ECDIS generates SENC charts for use with 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-ENC" charts in this manual.
3-2