Furuno 1824C manual Guard Alarm, Setting a guard alarm zone, How to set a guard alarm zone

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.

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.

2.22.1Setting 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 Trackball 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 Trackball 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.

3nm

12/LP

H-UP

1

MOVE +CURSOR TO ANOTHER CORNER OF GUARD1 AND PUSH KNOB TO SET.

319.9°M ALARM

SET

GUARD1

SET

GUARD2

RETURN

+ 317.2 ˚R 11.60nm

3nm

12/LP

H-UP

NO ALARM

319.9°M ALARM

GUARD 1

SET

GUARD1

2

ERASE

GUARD1

SET

GUARD2

RETURN

+ 39.9 ˚R 8.800nm

(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.

How to set a guard alarm zone

The equipment then searches for targets inside the guard zone to determine guard alarm type. If a target is found inside the guard zone, the guard zone type becomes an “Outward guard alarm,” and any target exiting the guard zone will trigger the audio alarm. If no target is found, the guard zone type becomes an “Inward guard alarm,” and any targets entering the guard zone will trigger the audio alarm. The guard alarm type is shown as G1(G2) IN or G1(G2) OUT.

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