Chapter 8: Using the Radar (Digital) 207
You can adjust the sensitivity of guard zones on the Alarms Setup Menu. For more
information, see
Alarm Setup Menu
on
page 289
.
Guard zones only operate when the whole zone is displayed on the screen. To avoid
inappropriate alarms, they become active ten seconds after being placed or edited.
To place a guard zone
1. Press the TARGET TRACKING softkey.
2. Press the MONITOR IN ZONES softkey.
3. Toggle ZONE 1 or ZONE 2 to ON, as appropriate.
4. Press the corresponding SET UP ZONE softkey.
5. Choose your zone shape.
6. Set the limits of the guard zone using the rotary controller.
7. Press OK.
MARPA
The Mini Automatic Radar Plotting Aid (MARPA) provides target-tracking and risk-
analysis features. MARPA obtains detailed information for up to 25 automatically
tracked objects (using a digital radar) and provides continuous, accurate and rapid
situation analysis.
To use MARPA, you need a fast heading sensor.
Note: Marpa will NOT operate with dual range switched on.
6nm Head-Up
D6832-2
Circular
Guard Zone
6nm Head-Up Relative Motion
Rings 1nm
D6815_3
Sector
Guard Zone
81244_4.book Page 207 Thursday, January 31, 2008 1:53 PM
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