Furuno FR-2105-B - Manual (Page 41)

-1.24-
The zone has a fixed width of 0.5 nm in the radial direction (depth) and is adjustable only
within 3.0 to 6.0 nm from own ship. On the R-type, the outer and inner boundaries can be set
at any distance. On any radar type, the sector of the zone can be set anywhere between 0 and
360 degrees in any direction.
To set a target alarm zone:
1. Place the cursor (+) at point "A" (see figure below) using the trackball.
2. Press the RADAR MENU key to show the FUNCTION 1 menu.
3. Press [2] key to set start point (point "A") of the alarm zone. The message TGT ALARM 1
(or 2) SET appears at the bottom-right corner of the screen.
4. Move the cursor (+) to point "B" and press the [2] key again. Then, the target alarm zone as
illustrated is created and the label TGT ALARM 1 (or 2) appears instead of TGT ALARM
1 (or 2) SET at the lower-right corner of the screen.
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 [2]
key.
If you change the range scale to less than half of the TAZ, the warning TGT ALARM 1 (or
2) OUT appears instead of TGT ALARM 1 (or 2).
5. Two alarm zones can be set as described above. Press [ENTER] and [2] keys in that order
while displaying the FUNCTION 1 menu and repeat the above steps.
000 010
020
030
040
050
060
070
080
090
100
110
120
130
140
150
160
170 180 190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
TAZ
A
B
Target alarm zone (TAZ) can be set in any sector
between 3 and 6 nm on IMO-type, or anywhere on
the R-type.
When the radar has an ARPA board ARP-26, a total
of 4 alarm zones (2 each TAZ and GZ) may be set.
The 2nd TAZ or 2nd GZ is available only when the
1st TAZ or 1st GZ is valid.
Acknowledging alarm
A target entering the watch zone produces both visual (flashing) and audible (beeping) alarms.
To silence the audible alarm, press [2] key shortly on the FUNCTION 1 menu and the label
TGT ALARM 1 ACK replaces TGT ALARM 1 on the display.
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 [2] key again on the FUNCTIONS 1 menu.
When an external buzzer is connected, the audible alarm does not stop until deactivation of the
guard alarm.