Furuno FR-8251 manual Setting a Guard Alarm Zone, Selecting guard zone type, 24 In and out alarms

1.28Setting a Guard Alarm Zone

The guard allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. violate the guard zone an aural alarm sounds and the offending target blinks to call the operator’s attention. Two areas can be set, zone 1 (short dashed line) and zone 2 (long dashed line), and one may be active.

1)Press the MENU key.

2)Select the GUARD menu.

3)Press the ENTER/SELECT key.

4)Select MODE and press the ENTER/SELECT key.

5)Select IN (or OUT).

6)Press the ENTER/SELECT key.

7)Press the MENU key.

WARNING

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

•A/C SEA, A/C RAIN and GAIN should be properly adjusted to be sure the alarm system does not overlook target echoes.

Selecting guard zone type

The guard alarm can be set to sound when a tar- get either enters (or exits) the guard zone. You can select which type of guard alarm you want to use through the GUARD menu. N-type: IN type alarm only.

In alarm: The alarm sounds on targets entering the guard zone. (IN) appears at the top right-hand corner when the In alarm is selected.

Out alarm: The alarm sounds on targets exiting the guard zone. (OUT) appears at the top right-hand corner when the Out alarm is selected.

Dashed line: no alarm

Guard zone

IN ALARM OUT ALARM

Figure 1-24 In and out alarms

Activating the guard zones

Two guard zones may be set and one of them may be active. Select the guard zone to make active on the GUARD menu.

1)Press the MENU key.

2)Select the GUARD menu.

3)Press the ENTER/SELECT key.

4)Select AREA NO. and press the ENTER/SE- LECT key.

5)Select guard zone to make active; GUARD1 (or GUARD2).

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Setting a guard zone

1)Referring to (1) in Figure 1-30, operate the trackball to place the cursor at point A or B.

2)Press the GUARD ALARM key. GUARD1 (or GUARD2) SET appears at the top right cor- ner on the display. See Figure 1-30 (2).

3)Operate the trackball to place the cursor at point C or D. See Figure 1-30 (3). GUARD1 (or GUARD2) IN (or OUT) appears.

4)Press the GUARD ALARM key.

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