Chapter 3: Standard Radar Operations 3-19
Setting Guard Zones
and Alarms
3.5 Setting Guard Zones and Alarms
The PathfinderPlus Radar display allows you to set up one or two guard
zones,using the ALARMS key. Youcan set up sector zones or 360° (circular)
zonesasshowninFigure 3-13.
Note: You can only view and control guard zones if you are using the Master
display (that is, the display to which the scanner is connected).
Figure 3-13: Guard Zone Display
Guardzones are fixed with respect to the ship’s headingmarker (SHM),
moving as the SHM moves.They also move if you offsetthe center, or if you
changethe range scale, so that the area you have marked is maintained.
The guardalarm sounds when a target enters a guard zone, exceeding the
target density threshold within the zone; the alarm alsosounds on a repeater
display.The alarm sensitivity controlallows you to set the thresholdabove
whicha new target will trigger an alarm, and also to turn the alarm on or off.
Note: A guard zone only operates when the whole zone is displayed on the
screen, or could be displayed by offsetting the center. In addition, a guard
zone is inactive for 10 seconds after it is placed or re-sized, to avoid inappro-
priate alarms during positioning.
This section coversthe following topics:
• Placing a guard zone
• Moving,reshapingor deletinga guard zone
• Controlling guardzone alarms
T
AUTO
IR
3nm
RR
1/2
H-UP
126°T
GRD
CURSOR
BRG R
031°
RNG nm
2.24
D3975-1
Guard zone 1, sector zone
(short-dashed line)
Guard zone 2, circular zone
(long-dashed line)
81186_3.book Page 19 Thursday, August 22, 2002 8:23 AM
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