NT888G MK2 AUTOPILOT OPERATING MANUAL
2.8 The Alarm TEST/OFF Key.
The Autopilot Control Unit is equipped with an audible alarm which, in most cases,
accompanies display indications of alarm and warning conditions.
Under normal operating conditions, the alarm is silent but
becomes active consistent with Watch Alarm timeout
period, OHA level, input data fail etc. and is
cancelled/acknowledged by single press of the
“
TEST/OFF
” keypad.
The audible alarm function can also be permanently turned
OFF
(muted) by
continuous 5 second press of the “
TEST/OFF
” keypad and is confirmed by the Alarm
icon at the bottom left corner of the Control Unit display.
Once muted, the audible alarm can be restored by continuous 5 second operation of
the same keypad.
An alarm
TEST
function is available at any time during the
STANDBY
or
ON
operating modes via double press of the “
TEST/OFF
” key. This is followed by
sequential illumination of all nine keypad corner LEDs accompanied in each case by
an audible bleep and a 10
th
bleep at test end. If audible alarms are muted they will be
automatically re-enabled.
2.9 The TRACK Key.
Track Mode Steering operation is only possible when the Autopilot System is
engaged (
ON
) and Track Steer data is available to the Autopilot from an external
source such as Track Plotter/ECDIS or Track Control System etc.
The Track key corner LED will also be illuminated and the operating mode shown on
the display will be “
TRACK
”.
Received Track data type ($xxHTC, $xxHSC or $xxAPB) and Active Heading source
(HDT1, HDT2, Coil etc.) will be shown in the Track steer section of the display every
18 seconds and the main display area will show heading to waypoint/new heading to
next waypoint accompanied – in some cases – by audible alarm requesting operator
“
CANCEL/CONFIRM
” key acknowledgement.
An alarm will also sound in the event of Track data fail.
The Track Mode can be turned off at any time by single press use of the Track key
(corner LED off).
The Track data type required by the Autopilot is Heading to Steer
(HTS) and provided valid HTS data is available, operation of the
TRACK key will be confirmed by a “vessel towards distant
waypoint” graphic shown in the display with related Track
information of heading to waypoint and vessel aspect left or right
of the required heading.
