AUTOHELM ST 50 plus - Position and Display Settings

3 .9 Position Correction
If you plot your current position
on a chart
that
uses a different datum to
that set in the position transducer you
may
notice an error . If
an accurate
current position is known a correction can be entered
to
allow for
the
different chart datum .
Radio position transducers (Decca and Loran) suffer from radiowave
interference which can be caused by atmospheric changes, local land
masses and time of day . This interference produces positional errors . If
an accurate current position is known, a correction can be entered . It is
important that this is only used to correct for land mass induced errors . It
should only
be set up
during
the middle of the daylight period and when
atmospheric
conditions are
fairly
stable .
Position Correction
Setting
1 .

Press and hold DISPLAY and TRACK together for 2 seconds .
2 .

Cycle DISPLAY until COR OFF is displayed .
3 .

Press V or ^ to select COR ON .
4 .

Press DISPLAY
to show
LAT
(Latitude) . Use the
V
or
^
keys to
adjust the displayed position .
5 .

Press DISPLAY
to show
LON (Longitude)
. Use the V or ^ keys to
adjust the displayed position .
6 .

Press and hold DISPLAY and TRACK for 2 seconds to store the
adjusted
Latitude and
Longitude .
The instrument
will
now display the corrected position .