Guard Alarm; Setting A Guard Alarm Zone - Furuno 1722C Operator's Manual

2. RADAR OPERATION
2.22

Guard Alarm

The guard alarm allows the operator to set the desired range and bearing for a
guard zone. When ships, islands, landmasses, etc. violate the guard zone, an
audio alarm sounds and the offending target blinks to call the operator's
attention.
The alarm should not be relied upon as
the sole means for detecting possible
collision situations.
A/C SEA, A/C RAIN and GAIN controls
should be properly adjusted to be sure
the alarm system does not overlook
target echoes.
2.22.1

Setting a guard alarm zone

To set a guard alarm zone, set the radar to transmit and do the following:
1. Press the [ALARM] key.
2. Use the cursor pad to set the cursor on the top left corner (or top right corner)
of the guard zone you want to set, then press the SET GUARD1 or SET
GUARD2 soft key, depending on which guard zone you want to set.
3. Use the cursor pad to set the cursor on the bottom right corner (or top left
corner) of the guard zone area and push the [ENTER] knob.
4. Press RETURN soft key to finish.
.125nm
.250/
SP
H-UP
MOVE +CURSOR TO
ANOTHER CORNER OF
GUARD1 AND PUSH KNOB
TO SET.
(1) Drag cursor to top (or bottom) corner
for guard zone and press the SET
GUARD1 or SET GUARD2 soft key.
2-30
CAUTION
319.9 M
ALARM
SET
GUARD1
1
SET
GUARD2
RETURN
317.2 R
+
0.230nm
How to set a guard alarm zone
.125nm
.250/ 319.9
SP
H-UP
E V
19.9 .125n
NO ALARM
B R
. 032nm
T m
L M
(2) Drag cursor diagonally to bottom (or top)
corner for guard zone and press the [ENTER]
knob.
M
ALARM
GUARD 1
SET
GUARD1
ERASE
GUARD1
2
SET
GUARD2
RETURN
39.9 R
+
.0.230nm