What does the guard ring/zone alarm monitor?

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Guard ring and zone alarms are set to provide an early warning by watching for targets that come within a defined distance or cross the boundaries of a protected area around your vessel. When a target approaches close enough to the defined range or moves into (or across) the guarded zone, the system triggers an alarm so you can take avoiding action or monitor more closely. This functionality focuses on relative position and movement, not on weather patterns or signal strength, and it applies to moving targets as they enter or traverse the zone rather than only targets that are stationary.