NT888G MK2 AUTOPILOT OPERATING MANUAL
2.38 (ii) Track Mode Alarms.
Two alarm types may be generated during the Track Steering Mode:-
a) No data/data fail:-
The NMEA Track Data fail/no data alarms are both audible
and visual appearing in the bottom left corner of the display as
“HCS fault: Track steering failed. No input data”
and
persist until the Track key is used to disable the Track Steering
Mode.
b) New Heading (course change) to new waypoint:-
(Item (i) above refers).
2.38 (iii) Engaging the Track Function.
Provided the Autopilot is engaged (switched to the
ON
mode) and suitable IEC 61162
/ NMEA Track Data is available, the Track function is simply engaged by operation of
the
TRACK
key and will be confirmed by the Control Unit display and illumination of
the corner LED in the
TRACK
key.
2.39 Manual and Auto Deviation Correction.
Magnetic
Deviation.
A Navitron Heading Sensor Coil (type HSC 1 or HSC 2) attached above or below a
magnetic compass to transmit heading information to the Autopilot system will be
subject to any deviation errors associated with the compass.
Provided such errors are not totally abnormal they can be electronically corrected by
the Autopilot system via access to the set up Menu.
Two deviation correction procedures are available (Set Up Menu Parameter No. 58)
as
MANUAL
or
AUTO
and an existing deviation table can be cleared down using the
CLEAR
facility.
Automatic Deviation Correction.
This is only available when NMEA (HDT sentence) heading information is connected
to the Autopilot in addition to the Sensor Coil (i.e. when swinging the vessel, the
Sensor Coil information can automatically be compared with the IEC 61162/1 or /2
$xxHDT sentence input and electronically corrected accordingly).
Manual Deviation Correction.
This is the only facility for electronic deviation correction if the Sensor Coil is the
solitary heading input for the Autopilot.
