Furuno FR-1710 - Manual (Page 31)

1-17
Target alarm
zone
A
B
Figure 1-20 Target alarm
Note: If you wish to create a target alarm
zone having a 360-degree coverage around
own ship, set point “B” in almost the same
direction (approx.
±
3
°
) as point “A” and press
the [GZ ALARM] key.
Two alarm zones can be set as described
above. To change the active alarm zone, do
steps 1 thru 4 in the above procedure. (When
both alarms are prepared the active alarm is
circumscribed.)
Acknowledging alarm
A target entering the target alarm zone pro-
duces both visual (flashing) and audible
(beeping) alarms. To silence the audible
alarm, press the [AUDIO OFF] key shortly.
ACK replaces IN (or OUT).
This will deactivate the audible alarm but will
not stop the flashing of the target in the guard
alarm zone. To reactivate the audible alarm,
press the [GZ ALARM] key again.
To silence the audible alarm, you may press
the [AUDIO OFF] key. However, in this case,
the label ACK does not appear.
Deactivating target alarm zone
Hold the [GZ ALARM] key depressed for at
least 5 seconds.
Inward and outward alarms
The inward target alarm generates visual and
audible warnings when a target enters the
target alarm zone from any direction. The
outward target alarm is produced when a tar-
get leaves the target alarm zone. (This is not
a target alarm by definition but some users
find this feature valuable.)
Dashed line: No alarm.
Alarm sounds when target
violates alarm setting.
Target alarm
zone
OUTWARD ALARM INWARD ALARM
Figure 1-21 Inward and outward alarms
1.23 Off-centering (shift)
Own ship position, or sweep origin, can be
displaced to expand the view field without
switching to a larger range scale. The sweep
origin can be off-centered to a point speci-
fied by the cursor, up to 75% of ranges other
than 72, 96 and 120 nm.
This feature is not available on the longest
range scale or in the true motion mode. The
number of range rings increases keeping the
original range intervals unchanged.
To off center the radar picture:
1. Place the cursor at a position where you
wish to move the sweep origin by operat-
ing the trackball.
2. Press the [SHIFT] key. Then, the sweep
origin is off-centered to the cursor posi-
tion. However, the heading line is left in
the same position.
3. To cancel off-centering, press the [SHIFT]
key again.
Cursor Cursor
(a) Select location
with cursor. (b) Press SHIFT
key to offcenter.
Figure 1-22 Off-centered display