Trio Avionics Pro Pilot - Manual (Page 8)

Trio Pro Pilot Manual 3.8
8
Chapter 1
Horizontal Navigation Overview (HNAV)
The H NAV function of the Pro Pilot controls the roll axis servo for attitude correction (wing leveling) and
provides horizontal navigation using signals from a GPS receiver or EFIS system.
GPS Requirements
The Pro Pilot does not contain a built-in GPS or other navigation data source. It is necessary that an
appropriate host GPS source be supplied and correctly connected to the Control and Display Head at the
time of installation. (See the Installation Instructions later in this manual.)
The Pro Pilot uses a solid-state inertial rate sensor for attitude stabilization. It uses elements of the host
GPS digital data stream for the navigation function. It accepts either a NMEA 0183, V2.XX stream
format or the Aviation Link format for navigation guidance. An ARINC 429 upgrade is available to enable
the GPSS and GPSV options.
Operation
While the Pro Pilot is an excellent “wing leveler,” its greatest strength is following an active flight plan
from a GPS source. This can be as simple as a “GOTO” a waypoint as commanded by the GPS, or a
complex, multi-segment flight plan.
Three horizontal navigation modes allow the pilot to follow a selected GPS course or flight plan.
Basic H NAV Operation Modes
The capabilities of the H NAV system comprise four basic modes:
1.) Track Mode tracks a GPS directed flight plan courseline.
2.) Course Mode tracks a pilot directed heading.
3.) Intercept Mode flies the airplane back to a previously entered courseline.
4.) When directed, execute a 180 degree course reversal
Note: The Pro Pilot also uses the GPS derived information to monitor the inertial sensor
performance and provides automatic corrections to the sensor data to correct for drift due
to thermal shifts, inherent sensor drift and noise errors. The Pro Pilot has a flash based
EEPROM memory that is updated automatically with the most current dynamic calibration
information during each flight.