Furuno FR-1710 manual Off-centering shift, Acknowledging alarm, Deactivating target alarm zone

Target alarm zone

A B

Figure 1-20 Target alarm

Note: If you wish to create a target alarm zone having a 360-degree coverage around own ship, set point “B” in almost the same direction (approx. ±3°) as point “A” and press the [GZ ALARM] key.

Two alarm zones can be set as described above. To change the active alarm zone, do steps 1 thru 4 in the above procedure. (When both alarms are prepared the active alarm is circumscribed.)

Acknowledging alarm

A target entering the target alarm zone pro- duces both visual (flashing) and audible (beeping) alarms. To silence the audible alarm, press the [AUDIO OFF] key shortly. ACK replaces IN (or OUT).

This will deactivate the audible alarm but will not stop the flashing of the target in the guard alarm zone. To reactivate the audible alarm, press the [GZ ALARM] key again.

To silence the audible alarm, you may press the [AUDIO OFF] key. However, in this case, the label ACK does not appear.

outward target alarm is produced when a tar- get leaves the target alarm zone. (This is not a target alarm by definition but some users find this feature valuable.)

Dashed line: No alarm. Alarm sounds when target violates alarm setting.

Target alarm zone

INWARD ALARM OUTWARD ALARM

Figure 1-21 Inward and outward alarms

1.23 Off-centering (shift)

Own ship position, or sweep origin, can be displaced to expand the view field without switching to a larger range scale. The sweep origin can be off-centered to a point speci- fied by the cursor, up to 75% of ranges other than 72, 96 and 120 nm.

This feature is not available on the longest range scale or in the true motion mode. The number of range rings increases keeping the original range intervals unchanged.

To off center the radar picture:

1.Place the cursor at a position where you wish to move the sweep origin by operat- ing the trackball.

2.Press the [SHIFT] key. Then, the sweep origin is off-centered to the cursor posi- tion. However, the heading line is left in the same position.

3.To cancel off-centering, press the [SHIFT] key again.

Deactivating target alarm zone

Hold the [GZ ALARM] key depressed for at least 5 seconds.

Inward and outward alarms

The inward target alarm generates visual and audible warnings when a target enters the target alarm zone from any direction. The

	Cursor	Cursor
(a) Select location		(b) Press SHIFT
with cursor.		key to offcenter.

Figure 1-22 Off-centered display

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