1. RADAR OPERATION
1-39
1.23 Target Alarm
The target alarm serves to alert the navigator to targets (ships, landmasses, etc.)
entering a specific area, with audiovisual alerts.
• The alarm should not be relied upon as
the sole means for detecting possible
collision situations.
• A/C SEA, A/C RAIN and GAIN controls
should be properly adjusted to be sure
the alarm system does not overlook
target echoes.
The target 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 (target alarm zone 1) and any distance
(target alarm zone 2). On the Non-IMO radar the boundaries can be set at any
distance. On any radar type the sector of the zone can be set from 0 to 360
degrees in any direction.
1.23.1 How to set a target alarm
The procedure below shows how to set a target alarm using the figure below as
an example.
1. Left-click TARGET ALARM1 or TARGET ALARM2 box, whichever alarm you
wish to put the cursor jumps into the effective display area and "SET"
appears inside the TARGET ALARM box selected.
TGT ALM1
TGT ALM2
TARGET ALARM boxes
2. Use the trackball to put the cursor on point "A" then push the left button.
3. Use the trackball to put the cursor on point "B" then push the left button.
"WORK" replaces "SET" in the TARGET ALARM box. The target alarm
zone’s lines are shown in dashed lines.
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Target alarm zone
A
B
X
X
Point A
X
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X
Point B
Point B
Point B
Point A
Point A
Other alarm zone examples
Target alarm zone
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