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4. AIS OPERATION
4-9
4.13 Proximity Alarm
The proximity alerts you by audio and visual alarms when an AIS target (or ARP target) is within
the range you specify.
1. Press the MENU key to open the menu.
2. Choose Target and press the ENTER key.
3. Choose Proximity Alarm and press the ENTER key.
4. Choose appropriate range and press the ENTER key.
5. Press the MENU key to close the menu.
When an AIS target comes within the range set here its symbol flashes and the audio alarm
sounds. Press the CANCEL/HL OFF key to silence the audio alarm. The flashing continues
until the target is no longer within the range set, the alarm range is changed to exclude the
offending target or the proximity alarm is disabled.
4.14 Lost Target
When AIS data is not received from a target at prescribed interva (3-5* report intervals), the audio
alarm sounds and the target symbol (flashing) appears as below.
Lost target symbol
* The interval at which AIS data is sent depends on speed of AIS transponder equipped vessel,
and it is shown in the table below. For further details, consult the operator’s manual for the AIS
transponder.
Ship speed and reporting interval
Ship speed Reporting interval
0-14 kts Every 10 seconds
23 kts or higher Every two seconds
Off
0.5nm
1nm
2nm
3nm
5nm
6nm
12nm
24nm