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Radar Operation Manual Page 41
6.18 How can I be advised of potential dangers for the navigation?
Using the Guard Zone alarms.
6.19 What are Guard Zones?
Guard Zones are zones defined by the user that causes an audible and visual alarm to be
triggered when a target exceeding a certain density enters into it. The density of the target
that may trigger the alarm is regulated by mean of the Guard Zone sensitivity. There are two
types of Guard Zones: Circular or Sectorial. They are fixed with respect to the ship position
and heading but their range and orientation (only for sector type) are user defined.
6.20 How should I set the Guard Zone sensitivity?
Guard Zone sensitivity must be regulated accordingly to the current Gain of the Radar. The
higher the sensitivity the smaller the target that may trigger the alarm. In general if you
regulated your Radar to obtain a clean picture you can set the Guard Zone sensitivity very
high to detect even the smaller targets. In case in the Radar picture is present clutter due
to the higher gain set, you'll have to reduce the Guard Zone sensitivity to avoid triggering
false alarms. In general a way to set the maximum sensitivity for a Guard Zone is to start
increasing the sensitivity until an alarm is triggered and then reduce the sensitivity until the
alarm stops.