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GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 1-4 Rev. 4
1.4 GTN/GMA 35 System Overview
The GTN WAAS navigators are a family of aviation panel mounted retro-fit products that are intended to
supersede the Garmin 400/500 WAAS series GPS, GPS/COM, and GPS/NAV/COM retro-fit products.
The GTN 6XX product family consists of the GTN 625 GPS/SBAS navigator, the GTN 635
GPS/SBAS/COM navigator, and the GTN 650 GPS/SBAS/NAV/COM navigator. The GTN 7XX product
family consists of the GTN 725 GPS/SBAS navigator, and the GTN 750 GPS/SBAS/NAV/COM
navigator. See Appendix E for an overview of the system interfaces to the GTN unit.
The optional GMA 35 audio panel is both a marker beacon receiver and an audio panel with 6-place
intercom that interfaces to the GTN 7XX, communications and navigation radios, headsets, microphones,
and speakers. The GMA 35 is feature-rich, but is similar in basic function to the GMA 340 and GMA 347
audio panels, except that the GMA 35 is remote-mounted and relies upon the GTN 725 or GTN 750 to
control and display the audio functions. The GTN 7XX controls and displays the functions of the
GMA 35 via digital interface.
1.4.1 GTN Unit Descriptions
Table 1-2 shows the attributes of each GTN unit.
Table 1-2. Attributes of GTN Units
GTN 625 GTN 635 GTN 650 GTN 725 GTN 750
GPS/SBAS
COM Radio
NAV Radio
GMA 35 Control
1.4.1.1 GTN 7XX Series Description
The GTN (Garmin Touch Navigation) 7XX WAAS navigators are a family of GPS/NAV/COM aviation
panel-mounted products that supersede the Garmin 500W Series GPS/NAV/COM navigators. The
GTN 7XX series units include the GTN 725 and GTN 750. The GTN 7XX units are 6.25 inches wide and
6.00 inches tall. They feature a 600 by 708 pixel color LCD touchscreen which provides a rich and
intuitive user interface. The GTN 725 is a GPS/SBAS unit that meets the requirements of Technical
Standard Order (TSO)-C146c and may be approved for IFR en route, terminal, oceanic, non-precision,
and precision approach operations when installed in accordance with the instructions in the manuals
referenced in the GTN AML STC. The GTN 750 includes all of the features of the GTN 725 in addition
to an airborne VHF communications transceiver and airborne VOR/localizer (LOC) and glideslope (G/S)
receivers. The GTN 725 and 750 also have the ability to remotely control GMA 35 audio panel functions.
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