Charts
ECDIS-E User Guide
4-74
65934012
Danger Settings
The following Danger settings can be enabled, or the default values
adjusted:
Look-Ahead Range
Added Breadth
Alarm on Cautions
Local Display Safety settings
To change the Danger settings do the following:
The Look-Ahead range controls how far in
advance an alert is given before a specified range
limit is reached. This range may be defined either
as time (minutes), or distance (nautical miles). The
Look-Ahead range controls the safety region,
which is indicated as a white outline rectangular
box around own ship. The Look-Ahead rectangle
follows the
COG
from own ship. The length of the
safety region represents the time, or distance, own
ship will travel, based on current
SOG
.
On a multi- node system the look-ahead range is
distributed and persisted across all nodes.
WARNING!
PROFILES THAT ADJUST LOOK-AHEAD TIME, BUT NOT LOOK
AHEAD DISTANCE WILL HAVE NO IMMEDIATE EFFECT ON THE
SIZE OF THE SAFETY CHECKING REGION IF LOOK-AHEAD
DISTANCE IS CURRENTLY SELECTED. PROFILES CREATED IN
VERSIONS BEFORE THE LOOK-AHEAD DISTANCE PARAMETER
WAS AVAILABLE MAY BE EDITED SO THAT THE LOOK-AHEAD
DISTANCE PARAMETER IS TAKEN INTO ACCOUNT.
1. To change the look-ahead time or distance click on the respective
radio button, the active field toggles depending on the selection
made. To change the time or distance, click in the field and move
the trackball right to increase the value, up to 60 minutes or 10 NM,
or decrease to a minimum of 0 minutes or 0.0NM (see note below).
As the Look-Ahead value is increased or decreased the safety
region lengthens or shortens and the area the system checks for
dangers is adjusted.
In some circumstances it may be desirable for the operator to select a zero
value for Look-Ahead time or distance, for example, when ownship is in a
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