Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Charts Radar/Chart Radar User Guide
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Danger Settings
The following Danger settings can be enabled, or the default values
adjusted:

Look-Ahead Range

Added Breadth

Alarm on Cautions

Display Safety Region
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 rectangular box around own ship
(shown as white in all Day/Night modes except
Day Bright, when is it shown as black). 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.
CAUTION:
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 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.