Furuno 1623 Manual De Usuario

1. OPERATION 

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, the audio alarm 
sounds to call your attention. The alarm will 
sound on targets entering or exiting the zone 
depending on zone status after the alarm has 
been 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.

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) Drag cursor to

top left corner for
zone and press
[ALARM].

 

Drag cursor
here.

Mentally create
the guard zone to set.

2) Drag cursor to

bottom right corner
for zone and press
[ALARM].

Guard zone completed.

Guard

zone

Drag cursor
here.

G(---)

    G(---)

After the guard zone is set, the system 
checks for the existence of 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

Note: "UP RNG" replaces G(IN) or G(OUT) 
when the guard zone is not within the range 
in use. If this happens, change the range to 
redisplay the guard zone. 
 

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. 
 

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