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16
Guard zone
to set
* G (IN)
(2) Drag cursor to
top left corner of
zone and press
[GUARD].
Asterisk blinking
Drag cursor
here.
(1) Mentally create
the guard zone to set.
G (IN)
(3) Drag cursor to
bottom right corner
of zone and press
[GUARD].
(4) Guard zone
completed.
G (IN)
Guard
zone
Drag cursor
here.
A
B
C
D
A
C
Figure 3-8 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 reacti-
vate 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 a useful anti-collision aid, but
does not relieve the operator of the respon-
sibility 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 dis-
appears and “G (IN)” or “G (OUT)” ap-
pears in inverse video. If this happens, raise
to re-display the guard zone.
¡ A target echo does not always mean a land-
mass, reef, ships or surface objects but can
imply returns from sea surface or precipi-
tation. As the level of these returns 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.
3.8 Watchman
The watchman function periodically transmits
the radar for minute to check for targets in a
guard zone. If it finds change in the zone from
the previous transmission it sounds the radar
continuously. This feature is useful when you
do not need the radars function continuously
but want to be alerted to radar targets in a spe-
cific area.
St-by
5, 10 or
20 min
Tx
1 min
Tx
1 min
St-by
5, 10 or
20 min
Watchman
starts.
Figure 3-9 How watchman works
How watchman works
When the time selected for the watchman rest
period has elapsed, the radar automatically
transmits for one minute to check the condi-
tion inside the guard zone. If there is no
change, the radar goes into stand-by
(“WATCHMAN” appears during stand-by.) If
there is change, the radar sounds the audible
alarm, cancels the watchman function and
transmits continuously.
Turning on watchman
1. Create a guard zone (usually 360 degrees)
with the guard alarm function.
2. Press the [MENU] key.
3. Select “OTHER MENU”.
4. Press the [ACQ/ENTER] key.
5. Select “15. Watchman”.
6. Press the omnipad to select watchman rest
period; 5 minutes, 10 minutes or 20 min-
utes.
27


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