Raytheon Pathfinder ECDIS Operator's Manual page 224

7.1.9 Guard Zone
The Guard Zone command allows you to tell ECDIS to monitor the ARPA target
distances and to generate a warning message if a target enters the specified
range. You may ask ECDIS to guard any where between 1 and 30,000 meters.
Procedure: (see Figure: 7−12)
Step 1 Select the ship menu (see Figure: 7−1).
Step 2 Select Guard Zone.... The dialog box appears.
Step 3 Click inside the Guard Zone Enabled check box. The ship's
Step 4 Enter the range (in meter) for which you want the alarm to
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current location appears beneath the check box.
sound if an ARPA Target is intruding the area defined by this range.
Figure: 7−12 Guard Zone Dialog Box
7−18
Edition: 30.MAR.2007