TruTrak Digiflight II Operating Manual - Manual (Page 6)

5
GPS Acquisition
Beneath the word
NO FIX a
flashing period • will appear
each time the GPS sends a
message to the autopilot (once
per second). This indicates the
GPS is working but has not yet
obtained a position fix. As long
as the period is shown, the NO
FIX display cannot transition to
the TRK mode.
When the GPS does obtain
a fix, the period will be
replaced by an asterisk *. This
means that when a certain
velocity is attained
GPS OK will
be replaced by TRK. This
happens at approximately 10
Knots ground speed as detected
by GPS and will even occur at
rapid taxi speeds.
If the GPS has a flight plan
entered there will be a + after
position fix is established.
Digiflight II
Lateral Modes
Upon being engaged, the
autopilot will be in the basic
lateral track mode, and it will
be synchronized to the direction
being flown at the time. The
number following SEL
(Selected direction) is
underlined, meaning that
rotation of the encoder will
select heading. Rotation of the
knob when it is not depressed
will cause 5
° steps of SEL and
when it is depressed the steps
will be 1
°.
If a GPS flight plan has
been entered into the GPS,
pushing MODE will engage the
GPS
NAV
mode and a flashing
plus sign will show. In the GPS
NAV
mode, the autopilot will
follow a flight plan
programmed into the GPS.
However, the autopilot must
over-fly each way point prior to
turning and intercepting the
next course line.
If the
GPSS
option has
been added, pushing the MODE
button will engage GPS
steering. In the
GPSS
mode the
autopilot follows lateral
steering or bank commands
generated by a navigation
system (EFIS or GPS).