5. AIS OPERATION
5-7
7. Select time interval, then press the ENTER key.
8. Press the MENU key to close the menu.
5.11 CPA/TCPA Alarm
Set CPA (Closest Point of Approach) alarm range and TCPA (predicted Time to CPA)
alarm time to alert you when targets are on a collision course. When CPA and TCPA
of any AIS target (including a sleeping target) become less than the preset CPA and
TCPA alarm settings, the audio alarm sounds. The alarm message "COLLISION" ap-
pears. The target symbol changes to a dangerous target symbol (red) and flashes with
its vector. You can stop the audio alarm and flashing with any key. The dangerous tar-
get symbol is displayed until the AIS target is not in the CPA and TCPA alarm setting
range. The AIS continuously monitors CPA and TCPA of all AIS targets.
This feature helps identify targets that can be on a
collision course.
1. Press the MENU key to open the menu.
2. Select [Target], then press the ENTER key.
3. Select [CPA], then press the ENTER key.
4. Select CPA distance, then press the ENTER key.
5. Select [TCPA], then press the ENTER key.
6. Select TCPA time, then press the ENTER key.
7. Press the MENU key to close the menu.
5.12 Proximity Alarm
The proximity alarm alerts you when an AIS target is within the range you set. The au-
dio alarm sounds and the alarm message "PROXIMITY" appears. The target symbol
changes to a dangerous target symbol (red) and flashes with its vector. Press any key
to stop the audio alarm and flashing. The dangerous target symbol is displayed until
the target is not within the range set, the alarm range is changed to exclude the target,
or the proximity alarm is deactivated.
1. Press the MENU key to open the menu.
2. Select [Target], then press the ENTER key.
3. Select [Proximity], then press the ENTER key.
4. Select the range, then press the ENTER key.
5. Press the MENU key to close the menu.
5.13 Lost Target
When AIS data is not received from a target at fixed interval (3 to 5* report
intervals), the target symbol changes to the lost target symbol (flashing). No
audio or visual alarm is given for a lost target.
Thicker than normal
activated target
(red and flashing)
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