NT888G MK2 AUTOPILOT OPERATING MANUAL
2.38 (i) Track Mode Display and Status Information … (Continued).
Every 18 seconds, this display is
interrupted for a period of 1 sec to
display the received HTS data
sentence type (HTC, APB or HSC)
and Active Heading sensor.
i.e.
HTC HDT1
DATA
Since arrival at a waypoint may
involve a significant course change
(
080
o
PORT
) or (
060
o
STBD
) etc.
based on
NEW HDG TO WP
data
received, this value is displayed and
will generate an alarm for
CANCEL or
CONFIRM
key operation as
appropriate:-
i.e.
NEW HDG XXX.X
o
= STBD
TO WP
080
o
NB. CANCEL/CONFIRM
key confirmation is only applicable to $xxHSC and $xxAPB
data – complex data type $xxHTC received from an Approved Track Control System
will be acted upon fully automatically (no CANCEL/CONFIRM action required) per full
Track Control System steering performance specs.
CONFIRM
key operation (APB/HSC data only) cancels the audible alarms and
permits the Autopilot to execute the turn (80
o
to Stbd in the example above).
CANCEL
key operation (APB/HSC data only) temporarily suspends the heading
change alarm for a fixed period of 15 seconds beyond which the alarm will sound
again until effective action is taken (Confirm key operated or Track key operated to
disable Track Mode Steering).
In the event that Track steering Mode
is selected but the Track data orders
“stand alone” Autopilot operation, the
Autopilot system will revert to the SET
Course which will be confirmed by the
display message “
NO TRACK
” as
shown.
