Furuno 1715 manual Guard Alarm, Setting a guard zone, How guard zone type is determined

1.OPERATION

1.20Guard 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, audio and visual alarms are released to call your attention. The alarms will be released for targets entering or exiting the zone depending on the presence or absence of targets in the zone when the alarm is set.

NOTICE

*The alarm should not be relied upon as the sole means for detecting possible collision situations.

*A/C SEA, A/C RAIN, FTC and GAIN controls should be properly adjusted to be sure the weak echoes will not be missed by the alarm.

Setting a guard zone

1.Operate the cursor pad to place the cursor at the top left corner for the zone and then press the [ALARM] key.

2.Operate the cursor pad to place the cursor at the bottom right corner for the zone and then press the [ALARM] key.

Guard	G(---)
zone
to set
	Place cursor
	here.

Mentally create	1)Place cursor at
the guard zone	top left corner for
to set.	zone and press
	[ALARM].

How guard zone type is determined

After the guard zone has been set, the radar checks for targets inside the guard zone, which takes about 8 to 12 seconds. When the check is completed, “G(IN)” or “G(OUT)” replaces G(---) at the top right corner.

G(IN): When no target exists in the zone, "G(IN)" appears. The audio alarm sounds against targets which enter the guard zone. G(OUT): If there are targets in the guard zone, "G(OUT)" appears. The audio alarm sounds against all targets which exit from the guard zone.

(a) Inward target alarm (b) Outward target alarm

Inward and outward alarms

Note: The guard zone disappears when it is not within the range in use. When this occurs "UP RNG" replaces G(IN) or G(OUT). Change the range to redisplay the guard zone.

Silencing the audio alarm

When a target violates the guard zone, the target flashes and the audio alarm sounds. You can silence the audio alarm with the [ALARM] key. The target continues flashing until the reason for the alarm ends or the guard zone is canceled.

G(---)

Guard zone

completed.

G(---)

Guard zone

Place cursor here.

2)Place cursor at bottom right corner for zone and press [ALARM].

Canceling the guard zone and guard alarm

Press and hold down the [ALARM] key until the guard zone is erased.

How to set a guard zone

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