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-38
2.2 Chart Monitoring: Own Ship against Vector - / User Chart Objects
Look-Ahead Sector/Alerts
Two different expanders provide a collection of settings
usable for chart and route monitoring during voyage
execution. The route related alerts are only activated if a
System Route has been activated for the system.
Look-Ahead Sector
Show on Chart activates a virtual sector in
front of the ship, formerly known as "guard
sector".
For this ECDIS Monitoring function and inde-
pendent of the visibility of the sector, the
program constructs a monitoring sector (look
ahead sector) with an adjustable sector width
and a length which can be defined here.
In the example shown here, the sector has a
length of one mile and a width of 250m at its
end
1)
.
The guard sector opens out from own position
in the direction of the ship's movement (i.e. the
COG/SOG vector) and is carried along with the
ship.
The monitoring is performed both with the
guard sector and with own position (i.e. the
own ship contour).
It takes place for several objects which are entered in the electronic chart or are stored as User Symbols.
The monitoring is therefore independent of whether the display of these objects is switched on or off.
Which chart objects or which user symbols are to be monitored is specified in the relevant performance
standards.
Whenever a monitored object is within the defined range of the sector or it touches or overlaps the
ship´s contour, the corresponding alarm is raised. See below under Alerts.
Even when the function Show on Chart is switched off, in any case the defined guard sector moni-
tors against the objects under Alerts in the frame below.
It might be an advantage to suppress the guard sector monitoring if the speed is very low or the ship
is stationary.
1)
The Look-Ahead Sector length can be defined by a time or a distance setting, whereby the value resulting in
the longer distance ahead will be used. With the time setting, the length of the guard sector is dependent on the
own ship´s speed.