Onwa Marine Electronics KR-1338C v.1 - Manual (Page 39)

Guard zone to set
A
Drag cursor here.
Asterisk blinking
1
Mentally create the
guard zone to set.
Drag cursor to top left corner of
zone and press [GUARD].
Guard zone
Guard zone completed. Drag cursor to bottom right corner of zone
and press [GUARD].
Figure 3-9 How to set the guard zone
Silencing the audible alarm
Any radar targets violating the guard zone will trigger the audible alarm. You can
silence the audible alarm by pressing the [GUARD] key. When this is done,
"G(ACKN)"replaces"G
IN "This means the alarm is acknowledgrd. Press
the key again to reactivate the alarm.
Cancelling the guard zone and guard alarm
Press and hold down the [GUARD] key until the guard zone disappears.
Notes on the guard alarm
The alarm is useful anti-collision aid, but does not relieve the operator of the
responsibility to also keep a visual lookout for possible collision situations.
When the radar range is less than one half of the guard zone range, the guard
zone disappears and
"
G(IN)
"
or
"
G OUT
"
appears in inverse video. If this
happens, raise to re-display the guard zone.
A target echo does not always mean a landmass, reef ,ships or surface objects
but can imply returns from sea surface or precipitation. As the level of these retu-
rns varies with environment, the operator should properly adjust the A/C SEA, A/C
RAIN and GAIN to be sure the alarm system does not overlook target echoes.
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