Furuno NAVNET 1724C - Manual (Page 55)

2. RADAR OPERATION
2-24
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.
CAUTION
• 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, then push the ENTER knob.
4. Press the RETURN soft key to finish.
.250/ 319.9 ° M .125nm
SP
H-UP
.250/ 319.9 ° M .125nm
SP
H-UP
317.2 ° R
0.230nm
ALARM
39.9 ° R
.0.230nm
V
R
M .125n
m
.032nm
E
B
L 19.9
T
NO ALARM
(1) Drag cursor to top (or bottom) corner
for guard zone and press the SET
GUARD1 or SET GUARD2 soft key. (2) Drag cursor diagonally to bottom (or top)
corner for guard zone and press the [ENTER]
knob.
MOVE +CURSOR TO
ANOTHER CORNER OF
GUARD1 AND PUSH KNOB
TO SET.
ALARM
GUARD 1
SET
GUARD1
ERASE
GUARD1
SET
GUARD2
RETURN
+ +
SET
GUARD1
SET
GUARD2
RETURN
1
2
How to set a guard alarm zone