4. AIS OPERATION
4-26
4.16 AIS System Messages
AIS system messages are displayed at the bottom right corner of the screen.
The table below shows the AIS system messages and their meanings.
AIS system messages
Message Meaning
AIS COLLISION CPA and TCPA of an activated AIS target are
below value set on the menu.
AIS NEW TARGET AIS target has entered an acquisition zone.
AIS LOST Lost target. An activated target is declared a
lost target when it fails to produce data for six
minutes or five reporting intervals, whichever
is the shorter.
AIS TARGET 95% Appears when capacity for AIS targets is 95%
full.
AIS TARGET FULL The radar only displays the closest 1000 AIS
targets from own ship.
ASSOCIATION Tracked target merged with AIS target. The
indication disappears when the target no
longer meets the criteria set in section 4.12.
When the message "RECEIVE" is displayed,
ASSOCIATION is not displayed.
NO CPA/TCPA FOR AIS CPA/TCPA cannot be calculated. Further the
CPA/TCPA value in the basic data display is
marked with an asterisk to indicate that it is
not reliable.
RECEIVE Not receiving AIS data from own AIS (VDO
message).
TRANSMIT ERROR Could not send AIS message.
WT Water tracking speed in use.
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