Furuno 1715 - Manual (Page 19)

1. OPERATION
11
1.20 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, 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.
* 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.
NOTICE
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
zone
to set
G(---)
1) Place cursor at
top left corner for
zone and press
[ALARM].
Place cursor
here.
Mentally create
the guard zone
to set.
2) Place cursor at
bottom right corner
for zone and press
[ALARM].
Guard zone
completed.
Guard
zone
Place cursor
here.
G(---)
G(---)
How to set a guard zone
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.
Canceling the guard zone and guard
alarm
Press and hold down the [ALARM] key until
the guard zone is erased.