1. OPERATIONAL OVERVIEW
1-20
1.19
Target Alarm
The target alarm serves to alert the navigator to
targets (ships, landmasses, etc.) entering a set
area, with audible and visual alarms.
The guard alarm zone has a fixed width of 0.5 nm
in the radial direction (depth) and is adjustable from
3.0 to 6.0 nm (guard zone 1) and any distance
(guard zone 2). The sector of the zone can be set
from 0 to 360 degrees in any direction.
The alarm may be set to sound against targets
entering or exiting the zone. See paragraph 1.20.3.
1.19.1
Setting a target alarm
The procedure which follows shows you how to set a target alarm, using the illustration below as
an example.
1. Press the
TARGET ALARM
key to activate ALARM 1 or ALARM 2 as appropriate.
2. Drag the cursor with the trackball to the location “A” and then press the
ENTER
key.
3. Drag the cursor to the location “B” and then press the
ENTER
key.
How to set a target alarm zone
Note 1:
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 as point "A."
Note 2:
Two target alarm zones may be set. Note however that the 2nd target alarm zone is avail-
able only when the 1st target alarm zone is active.
Note 3:
When the target alarm zone is not within the range in use the indication OUT RNG
appears in the alarm status area. In this case choose a range which will display the target alarm
zone.
CAUTION
•
The alarm should not be relied upon as
the sole means for detecting possible
collision situations.
•
SEA, RAIN and GAIN controls
should be properly adjusted to be sure
the alarm system does not overlook
target echoes.
+ 110.1
°
R 2.525 NM
+
3
NM
0.5
Cursor
+
+
Target alarm
zone
A
B
ALARM1_IN
Alarm status
