AUTOHELM ST 50 plus - Page 41

Initial Calibration Notes
Operating Mode
For normal operation the operating
mode should be set to 'MASTER' ; this
allows waypoints to be entered .
If the system includes
a Navcenter, or you wish to use waypoints entered
into another manufacturer's equipment,
the operating mode should be set
to 'REPEAT . In this mode the GPS/Navdata provides
cockpit repeater
capability only .
Data Port Format
This
should be set to NMEA for use with the Autohelm GPS receiver or
Navstar if using the
Navstar 2000D Decca receiver .
Variation
This allows the GPS/Navdata display to calculate and
display waypoint
bearings in degrees magnetic . The variation taken from a
local
chart
should be used .
Local Time Correction
The
position transducers generally transmit Greenwich Mean Time . The
local time difference should
be entered in hours .
Anchor Watch Distance
This sets the alarm distance for the anchor watch . If selective
availability is
active, it should be set to no less than 0 .08nm, 160m (520ft) .
Waypoint Arrival Circle
The waypoint arrival
circle defines the distance from the target waypoint at
which the arrival alarm sounds
.
Position Correction
If
you plot your current position on a chart that uses a different datum to
that
set up
in
the position transducer you may notice an error . If an
accurate position
is
known,
a correction can be entered to allow for the
different chart datum (refer to
Chapter 3 .8 for setting details) .
Exit Initial Calibration
Press and hold DISPLAY and TRACK for 2
seconds to return to normal
operation .