AP-18
APPENDIX 4 ALERT LIST
ALF ALR
Alert name
Priority/
Category
Meaning Remedy
No. Inst.* No.
115 - 115 Loss of System
Communication
Warning/
B
Loss of communica-
tion between pro-
cessor unit and
external equipment.
Check that the de-
vice is securely
connected.
150 - 150 Early Course
Change
Warning/
A
Waypoint is soon
being approached.
Ship's position is
less than set time of
prewarning from
WOL.
Default: 90 seconds
Be careful that
WPT is approach-
ing.
158 - 158 Course Difference Warning/
A
Waypoint is now be-
ing approached.
When alert 150 and
151 are not ac-
knowledged, ship
crosses WOL.
When alert 150 is
not acknowledged,
this is generated in-
stead of alert 151.
(30 seconds before
WOL)
Be careful that ship
crossed WPT.
159 - 159 Low Speed Warning/
B
While carrying out
TCS, ship's speed
becomes less than
set value.
Raise speed or
stop track control.
170 - 170 Positioning System
Failure
Warning/
B
All position data has
been lost for more
than 30 seconds.
Check the connec-
tion with all GPS.
171 - 171 Crossing Safety
Contour
Alarm/A When a check area
is set, the vessel
entered a shallower
area than the
threshold set in
[Safety Contour].
Reconfirm Safety
Contour setting or
change the course.
172 - 172 Off Track Alarm Alarm/A Deviation is big be-
tween planning
course and current
heading. While
monitoring route,
ship position devi-
ates XTD Limit.
Reconfirm XTD
Limit or keep own
ship inside of chan-
nel limit.
173 1 620 User Chart Danger
Area
Warning/
A
A User Chart Dan-
ger Area that is set
to Warning/Caution
in chart alert is de-
tected inside the
check area.
Be careful of the
object mentioned
left, on ship's direc-
tion.
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