Furuno FR-8111 - Manual (Page 38)

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1.28 Setting 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.
• 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.
WARNING
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
IN ALARM OUT ALARM
Guard
zone
Figure 1-24 In and out alarms
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.
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.