Si-tex T-760 Series, Инструкция по эксплуатации

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Chapter 5 VARIOUS FUNCTION ICONS
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5.4 GUARD ZONE FUNCTION
To use this function, GPS signal and heading signal (GYRO or GPS compass signal) are necessary.
Guard zone function used to detect an echo movement in the warning area. Warning
area can be set as in-alarm type or out-alarm type or both.
In-alarm: When a target entered the set zone, the alarm sounds.
Out-alarm: When a target went out of the set zone, the alarm sounds.
Warning area: Two automatic acquisition zones can be set in a sector.
These zones act as suppression zones, avoiding unnecessary overloading to the
processor and clutter by disabling automatic acquisition and tracking outside them.
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FOR REFERENCE
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Guard zone is moving accord with own ship movement.
T-760 series marine radar let you set a guard zone around your boat. You can
specify distance and set an alarm.
If your boat detects a buoy, landmass or any other obstacle within your guard
zone, the alarm sounds.
Guard zone function can help you monitor objects near to your boat and objects
further away at the same time.