APPENDIX
62
4. Conditions Which Display the Alarm for WT and
CPA/TCPA
•
When both VHW and VBW are input, priority is VBW>VHW.
•
When only VHW is received, status is as below.
•
When only VBW is received, status is as below.
•
When neither VHW or VBW is input, log error is displayed.
STW selected on menu
When data sentence VHW is present, and set, drift and VTG are on or off:
VHW Set, Drift VTG
Mode to be selected AIS alarm display
STW displayed
ON
BT
CPA/TCPA
(Note 3)
ON
OFF
OFF
WT
WT, CPA/TCPA
STW displayed
ON
BT
CPA/TCPA
(Note 3)
ON
OFF
ON
WT None
When data sentence VBW is present, and set, drift and VTG are on or off:
VBW Set, Drift VTG
Mode to be selected AIS alarm display
ON WT
WT, CPA/TCPA
ON
OFF
OFF
WT
WT, CPA/TCPA
ON WT
None
ON
OFF
ON
WT None
SOG selected on menu
When data sentence VHW is present, and set, drift and VTG are on or off:
VHW Set, Drift VTG
Mode to be selected AIS alarm display
ON
BT
CPA/TCPA
SOG displayed
ON
OFF
OFF
WT
WT, CPA/TCPA
(Note 4)
ON
BT
CPA/TCPA
SOG displayed
ON
OFF
ON
WT None
(Note 4)
When data sentence VBW is present, and set, drift and VTG are on or off:
VBW
Set, Drift VTG
Mode to be selected AIS alarm display
ON BT
None
ON
OFF
OFF
BT
None
ON BT
None
ON
OFF
ON
BT None
Notes
1. Because drift is ON.
2. Because of error (no VTG data).
3. STW shown in red. BT is selected because set and drift is input even though setting is
STW.
4. SOG shown in red. SOG is selected, however only VHW is input, therefore SOG cannot
be displayed.
5. LOG error. Neither VHW or VBW are input.
