Garmin GMR 21/41 - Manual (Page 12)

 GMR 21/41 Owner’s Manual
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Target Expansion Off Target Expansion On
Trails
Trails allows you to select whether all returns on the screen leave a
history trail, and allows you to determine the length of the history
trail (Off, Short, Medium, or Long).
Trails On Trails Off
Guard Zone
A Guard Zone is a user-defined area of protection. If a target enters
the Guard Zone, an alarm sounds. You can define two Guard Zones.
The Guard Zone Menu has two areas, “Guard Zone 1” and “Guard
Zone 2.” Each area has two settings, Show (Hide) and Adjust .
Guard Zone
To Define a Guard Zone:
1. Highlight Show Guard Zone 1 or 2, and press ENTER.
2. Highlight Adjust, and press ENTER.