Furuno 1734C Service Manual

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

.125nm
SP

H-UP

.250/ 319.9

.125nm
SP

H-UP

317.2

0.230nm

ALARM

39.9

.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

How to set a guard alarm zone