Simrad GO XSE Series Operator's Manual page 117

To specify which targets are displayed in the radar panel, use the
vessels and tracked targets dialog to define dangerous targets,
targets of interest and create target filters. Refer to "Vessels and tracked
targets" on page 134.
The guard zone option or target tracking zone option depends on
the radar source capability. Setting up the zones is similar.
Guard zones Target tracking zones
Two zones can be defined, each with individual settings.
When a target enters a zone, it will automatically be considered as
safe or dangerous based on the CPA/TCPA settings.
ZoneTrack
When selected, you can setup tracking zones or reactivate tracking
zones which were already setup. Alarms can be received when the
radar acquires a target inside a zone.
Unselect to disable all zones. The zones will be removed from the
radar image. The radar stops acquiring targets inside the zones and
no alarms will be sent.
Ú Note:
The ZoneTrack target limit is 50 targets per zone. The
target limit cannot be changed.
Setting a guard zone around your vessel
A guard zone is an area (either circular or a sector) that you can
define on the radar image. When activated, an alarm alerts you
when a radar target enters or exits the zone.
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Radar | GO XSE/XSR Operator Manual