User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 110 / 02 (2011-10)
Operating Instructions
A-9 CHARTRADAR (optional)
A RADAR.fm / 10.11.11
A-108
9.9 Setting the Look-Ahead Sector
If one or more ECDIS alerts are set as described before,
the chart monitoring is performed with the own ship’s
contour as a guard sector. This guard sector is extended
by a look-ahead sector thus achieving an appropriate
pre-warning time.
Open the Own Ship tab in the Alarms expander and
set the Distance in terms of nautical miles (NM) as well
as time (min) of the look-ahead sector (the first condi-
tion which applies, travel distance or time to dangerous
object, will activate the alert). These two parameters for
the distance (NM and min) will cover the speed of own
ship as well as the following example shows:
Own ship is sailing 15 kn per hour.
The time is set to 6 min as shown in the screenshot above.
The alarm would be activated at a distance of 6 min/ 60 min * 15 kn =1.5 NM
So this speed dependent alarm would already be raised at a distance of 1.5 NM and not at 1 NM as set
as a minimum.
Define the Width of the look-ahead sector as well. Check the Show on Chart control if the look-ahead
sector shall be visible in front of the own ship symbol or contour. The minimum settings are 0.5 NM, 1
min, and 10 m width meaning that the look-ahead sector is active at any time with a minimum size.
Suppressing of alerts is only possible from the above ECDIS Alerts menu.
Once set, the appropriate ECDIS Alerts are raised every time the look-ahead sector touches a safety
contour or obstacle. This chart monitoring process is independent wether the look-ahead sector is visible
or not and even independent wether the chart visualization is switched on or not.
But of course the optional CHARTRADAR function with the corresponding ENC charts for the actual
passage is required. For more details about the look-ahead sector see chapter C - 2.2 on page C-38.