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AIS
10-15
Own ship speed data (Note 3) Own ship course data (Note 3) Msg when signal below is lost (IMO and Non-IMO)
Mode
BT WT BT WT
Log
Pulse
VBW
WT data
Speed
Source
Set/
Drift
Msg on
IMO only
VTG
VBW
BT data
Remarks
LOG OFF WT VTG Log Pulse VTG GYRO LOG A-WT
A-CPA
LOG ON BT A-CPA A-CPA
LOG
NAV OFF/ BT VTG VTG A-CPA
ON
LOG OFF/ BT BT data of VBW BT data of VBW and
(S-BT) ON Gyro calculation
LOG OFF WT VTG
(S-WT)
MAN ON BT A-CPA
MAN OFF WT VTG MAN VTG GYRO A-WT A-CPA
A-CPA
LOG ON BT
(S-WT)
Not available
on IMO spec.
A-CPA
LOG
WT data
of VBW
VTG
BT data of VBW
and gyro
calculation
A-WT
A-CPA
A-WT
A-CPA
LOG
VTG VTG
VTG VTG
VTG VTG A-CPA
LOG
A-CPA
See Note 2
See Note 2
See Note 2
Note 1: "VTG" means VTG or RMC data, and the order of priority is VTG>RMC. MAN means manually entered ship’s speed; S/D means SET and DRIFT.
Note 2: "SET DRIFT" shown in red characters in this condition.
Note 3: Own ship speed and course data show the data which is used used to calculate CPA/TCPA and WT vector of AIS targets.
Ship’s speed and course data and A-WT, A-CPA alarm generating conditions
A-CPA
A-CPA
LOG
A-CPA
REF OFF/
ON
BT Target based speed Target based
course
A-CPA