4. AIS OPERATION
4-12
4.10 AIS Symbol Color
1. Right-click the AIS mode indication then click [Symbol Menu] to show that menu.
2. Select [1 SYMBOL COLOR] and desired color. (Red and yellow are not available
with the IMO type.)
4.11 AIS Lost Targets
An AIS target is declared a lost target when it fails to produce data for
intervals which are based on the table on page 4-1. When this occurs,
the target is marked with the lost target symbol (flashing), shown in
the right figure, the buzzer sounds (for activated targets only) and the
Alert 537 (ALF format: 193.3) "AIS Lost" appears.
To acknowledge a lost target, push the ALARM ACK key or click the [Alert] box.
Note: The AIS data transmission interval depends on target's speed. For example, the
data is transmitted every 10 seconds on the ship speed of 0 to 14 kn and every two
seconds on the ship speed of more than 23 knots. For details, see the owner's manual
of the AIS transponder.
4.11.1 How to enable, disable the AIS lost target alarm
The Lost TGT indication (at the bottom-right position)
enables, disables the lost target alarm. Click the indica-
tion to select [OFF], [FILT] or [ALL] as appropriate.
[OFF]: Disable the lost target alert.
[FILT]: Get the alert against the targets whose criteria
meet the settings made in section 4.11.2.
[ALL]: Get the alert against all lost targets.
Note: The [Lost TGT] setting is shared commonly between TT and AIS.
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