User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
C-2 Chart and Route Monitoring
C VOYAGE PLANNING & MONITORING.fm
C-40
2.2.1 Monitoring on the Basis of a Vector Chart
Warning against Sailing into an Area of Insufficient Depth
When a Safety Contour (See chapter 5.7 on page B-57) or another area with insufficient depth (less
than the set safety contour value) is touched by the guard sector, e.g. an object belonging to the object
class Land Area, the Crossing Safety Contour alarm appears in the alarm list. As soon as the own ship
contour is situated on the safety contour or on one of the other above-mentioned areas, the alarm like-
wise appears.
The safety contour is formed from all objects of the object classes Land Area and Intertidal Area and
from the objects of the object classes Depth Area or Dredged Area whose depths are equal to or the
next size greater than the value entered in the menu Presentation > ENC > Depth under Safety
Contour.
For this monitoring, the cells with the highest precision available in the chart database are used. They
might be different from the cells being used for display. It is therefore helpful to use another display
range for an additional visual check and to use the Info Box.
The setting of the guard sector for this monitoring process is performed in the same way as described
above in the menu Alarms > Own Ship. The output of the safety contour alarm can be generally
suppressed by means of the Safety Contour Alarm checkbox under Alarms > ECDIS Alerts .
Fig. C / 12 Generating the Chart Alarm with the Guard Sector (example: Safety Contour alarm)
Guard sector moves along
with the ship and its direction
is always the same as the
ship's direction of movement
(the guard sectorcan be
displayed on the screen)
Ahead Sector Length as set in
Alarms > Own Ship under
Distance
Safety contour
Ship's position when the
Crossing Safety Contour
alarm occurs
Ahead Sector width, set in the
Alarms > Own Ship menu