Furuno TZT22X Operator's Manual page 7

How to measure the range, bearing from own ship to a target
Target Target
Tap a target to show its range
and bearing from own ship.
How to set a guard zone How to set a guard zone
A guard zone alerts you (with aural and visual alarms) when a radar target enters the area you
specify.
Open the Layers
menu, tap the
[Overlays] tab.
Guard zone Guard zone
The guard zone appears in dashed
lines.
An icon appears at each corner
of the guard zone.
Tap the guard zone again.
Tap
20
30
40
60
Tap dashed line on guard zone.
Tap
Tap
Drag the icons to set guard zone.
ON
7 7
ON
ON
Tap
Tap
(Top right corner)
The dashed lines change to
solid lines, indicating the
guard zone is active.