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3. ARPA OPERATION
3-8
3.9 CPA/TCPA Alarm
Set [CPA] (Closest Point of Approach) alarm range and [TCPA] (predicted Time to
CPA) alarm time to alert you to the targets that can be on a collision course. When
[CPA] and [TCPA] of any ARPA target become less than the preset [CPA] and [TCPA]
alarm settings, the audio alarm sounds. The alarm message "COLLISION" appears.
The target symbol changes to a dangerous target symbol (triangle) and its vector
flashes. You can stop the audio alarm with any key. The flashing of the triangle stops
when the tracked CPA and TCPA of an ARPA target is not in the [CPA] and [TCPA]
alarm setting. The ARPA continuously monitors [CPA] and [TCPA] of all tracked ARPA
targets.
Dangerous target symbol
This feature helps identify the targets that can be on a collision course. Correctly ad-
just GAIN, A/C SEA, A/C RAIN and other radar controls.
1. Press the MENU key to open the menu.
2. Use S or T to select [Target] and press the ENTER key.
3. Use S or T to select [CPA] and press the ENTER key.
4. Use S or T to select [CPA] distance and press the ENTER key.
5. Use S or T to select [TCPA] and press the ENTER key.
6. Use S or T to select TCPA and press the ENTER key.
7. Press the MENU key to close the menu.
CAUTION
CAUTION
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.
Off
0.5NM
1NM
2NM
3NM
5NM
6NM
6min
30s
2min
3min
4min
5min
1min
12min
CPA distance settings TCPA settings