7. TT OPERATION
7-8
7.9 CPA/TCPA Alarm
Set CPA (Closest Point of Approach) alarm range and TCPA (predicted Time to CPA)
alarm time to alert you to targets that can be on a collision course. When CPA and
TCPA of any TT become less than the preset CPA and TCPA alarm settings, the audio
alarm sounds. The alarm message "COLLISION" appears. The target symbol chang-
es to a dangerous target symbol (triangle) and flashes with its vector. You can stop
the audio alarm with any key. The flashing of the triangle stops when the tracked TT
is not in the CPA and TCPA alarm setting. The TT continuously monitors CPA and
TCPA of all TT.
Dangerous target symbol
This feature helps identify targets that can be on a collision course. Correctly adjust
the gain, sea clutter and rain clutter.
1. Press the MENU/ESC key to open the menu.
2. Use the Cursorpad ( or ) to select [Target] and press the ENTER key.
3. Use the Cursorpad ( or ) to select [CPA] and press the ENTER key.
CPA options
4. Use the Cursorpad ( or ) to select CPA distance and press the ENTER key.
Before alarm
is released
(Flashing)
After alarm
is released
CAUTIONCAUTION
Do not depend on the CPA/TCPA alarm
as the only method to detect the risk of
collision. The navigator is not released
of the responsibility to keep visual caution
for collision situations, whether or not the
radar or other plotting aid is in use.
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