TruTrak Flight Systems
8
Gemini Autopilot Installation Manual
April 2015
8300-088 Rev IR
GPS Setup Guide
Many new handheld GPS’s have adequate output required to fly a TruTrak autopilot. Although most support
data output not all handhelds will provide consistent and reliable information required to fly all TruTrak autopilots.
Therefore, some handhelds will not fly the airplane well. Performance may decline by putting the processor in high-
load situations.
We require a data output rate of once per second for best performance. Some handhelds output data at longer
intervals than once per second. These handhelds will cause the autopilot not to perform well in turns and it may cause
overshooting and hunting. If the baud rate is selectable the optimum setting is 4800. Most handhelds will require a
data cable that plugs into the handheld and provides a medium for data output. This is an accessory and is available
from your GPS manufacturer. The setup procedures are in your GPS manual. If your GPS is not listed here consult your
GPS manual for NMEA output setup. The autopilot must have a direct connection with the handheld GPS to provide the
autopilot with RS-232. To allow the handheld GPS to be removed easily you should add a connector in your panel. We
recommend that you use a 9 pin D subminature connector in your panel that will mate to the harness from the GPS.
This will also allow you to wire power and ground and use the aircraft electrical system to power your handheld GPS.
Garmin GPS III
The Garmin III requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output.
The Garmin III must be configured to provide the correct output to the autopilot.
Press the
MENU
key twice. Select ‘Setup’. Press
ENTER
. Select the ‘Interface’ tab. Press
ENTER
. Select the
NMEA format.
Note: The default baud rate is 4800. This is the baud rate that will entered into the autopilot in the setup mode.
Garmin GPS 92
The Garmin 92 requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output. The Garmin
92 must be configured to provide the correct output to the autopilot.
Press the
PAGE
key until the ‘Main Menu’ appears. Select ‘Setup Menu’ and press
ENTER
. Next select
‘Interface.’ Press
ENTER
. Select NONE/NMEA.
Note: The default baud rate is 4800. This is the baud rate that will entered into the autopilot in the setup mode.
Garmin GPS 195
The GPS 195 provides data output every two seconds and may be slow in recognizing turns and will overshoot the
desired track. This may cause the autopilot to wander and not perform well in turns.
The Garmin 195 requires a Power/data cable (Garmin Part Number 010-10135-00) to provide data output. The Garmin
195 must be configured to provide the correct output to the autopilot.
Press the
MENU
key twice. Select ‘Set-Up Menu’. Press
ENTER
. Select ‘Input/Output’. Press
ENTER
. The
input/output format is ‘No In/NMEA Out.’ Note that the baud rate is automatically set at 4800 bps.
Note: This is the baud rate that will need to be entered in the setup mode of the autopilot.
Now the Garmin 195 is correctly set up to provide the RS-232 serial output required by your TruTrak autopilot.
Garmin GPS 196 / 295
The Garmin 196 requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output.
The Garmin 196 must be configured to provide the correct output to the autopilot.
Press the
MENU
key twice. Use the arrow keypad to select the ‘SETUP’ tab.
Within the Setup Menu select the ‘INTERFACE’ tab. Using the arrow keypad highlight the ‘Serial Data Format’
field. Use the arrow keypad to select ‘NMEA In/NMEA Out’ and press
ENTER
.
Set the baud rate to 4800.
Note: This is the baud rate that will need to be entered in the setup mode of the autopilot.
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