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4. AIS OPERATION
4-9
4.13 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 its vector flashes. 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, or 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. Use S or T to select [Target] and press the ENTER key.
3. Use S or T to select [Proximity] and press the ENTER key.
Proximity options
4. Use S or T to select the range and press the ENTER key.
5. Press the MENU key to close the menu.
4.14 Lost Target
When AIS data is not received from a target at fixed interval (3-5* report intervals), the
target symbol changes to the lost target symbol (flashing). No audio or visual alarm is
given for a lost target.
Lost target symbol
* The interval at which AIS data is sent depends on speed of the AIS transponder. For
detailed information, refer to the Operator's Manual for the AIS transponder.
You can remove all lost AIS targets from the display as follows:
1. Press the MENU key to open the menu.
2. Use S or T to select [AIS] and press the ENTER key.
3. Use S or T to select [ACK Lost Targets] and press the ENTER key.
ACK Lost Targets options
24NM
12NM
6NM
5NM
3NM
2NM
1NM
0.5NM
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