Trio Avionics EZ Pilot - v 1.9 - Manual (Page 12)

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BTW 025 XTK<0.02
TRK 025 KLAX
the interface. In the event the GPS signal is lost during normal area navigation the "NO
GPS" screen will be made active and the EZ Pilot will go into the wing leveler mode
following a “straight and level” course on the last commanded groundtrack. In this mode,
manual corrections to the dead reckoning track can be made using the electronic trim
feature. (See paragraph 3.1.5)
3.2.4 GPS Active, Normal Power Up Display
On power up, the EZ Pilot defaults to the TRK mode of operation. Once GPS signals
become active on the interface, and a flight plan is entered, the display illustrated below
is presented to the pilot. This display is the power up default presentation. It is possible
to have the displays shown in paragraph 3.2.9.7 (DIS?), paragraph 3.2.9.8 (TRN?) or
paragraph 3.2.9.9 (SPD?) if the conditions noted below are present at that time.
3.2.5 TRK Mode, GPS Signals Present
The diagram on the next page shows the EZ Pilot display immediately after power up
with a good GPS signal present, and flight plan entered. Note that the SERVO POWER
LED is not illuminated. Although the unit is fully capable of providing area navigation, the
SERVO pushbutton must be manually pressed (connected) before the EZ Pilot will take
control of the roll axis of the aircraft.
3.2.6 TRK Mode, BTW (Bearing To Waypoint Field)
The bearing to waypoint (BTW) field is located
on the left side of the top line as illustrated. This
field is updated whenever the GPS data to the
EZ pilot is refreshed, normally once every one or
two seconds, depending on the GPS interface
data rate. (A GPS with NEMA data output
normally updates once every two seconds, while
an Aviation Data Link updates once every
second.) BTW is the exact magnetic bearing
from the current aircraft position to the next GPS
route waypoint. Please note that the line directly
below the BTW data contains the current track
(TRK) information (if these two numbers are
identical, the aircraft is tracking directly to the
destination waypoint regardless of the actual
magnetic
heading of the aircraft).
3.2.7 Variable Field, Top Line
The right side of the upper line of the display may be changed to present any data
derived from the GPS available in the bottom line right field (see section 3.2.9) or an
electronic rate of turn display. The factory default display is to present the information
shown below, but the user may wish to otherwise configure this segment. See section 3.1
for details on setting the data to be displayed in this field.
3.2.7.1 XTK (Cross Track Error Field)
The Cross Track Error Field (XTK)
provides a distance measurement in
miles, tenths and hundredths of how
far the aircraft is positioned either right