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Thread: Garmin GTX 335 Question

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  1. #1
    Senior Member Maverick's Avatar
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    Default Garmin GTX 335 Question

    I am looking for my avionics and see that the Garmin GTX 335 transponder provides mode S, ADSB-Out, and GPS. My question is, how do you view the GPS? Does this transponder unit only work with EFIS? I do not want an EFIS. I plan to use good old steam gauges. I am unable to find information on how to display the GPS part of the unit and I can't find a means to write to Garmin to ask such questions.

    Also, Is there a different solution? I'd really like to find a package that has com radio, txp, adsb, and a GPS bundled but it doesn't seem to be out there.

  2. #2
    Senior Member PapuaPilot's Avatar
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    Default Re: Garmin GTX 335 Question

    Great questions.

    The GPS in the GTX 335 provides the WAAS position source for ADSB out. It isn't a GPS that can viewed or used for navigation.

    You can use this as a stand alone transponder with steam gauges (without an EFIS), but it looks like you will need to buy the altitude encoder too.

    There is no such thing as an all in one package like you mentioned. If you are doing steam gauges as a minimum you probably will want to get:
    1. COM/intercom
    2. Transponder/ADSB Out
    3. GPS Navigator w/ Screen
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

  3. #3
    Senior Member aviator79's Avatar
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    Default Re: Garmin GTX 335 Question

    If you upgrade to a GTX 345, It will wirelessly stream GPS, ADAHRS, traffic, and weather to the device of your choice.
    --Brian
    Flying - S7SS

  4. #4
    Hoenshell's Avatar
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    Default Re: Garmin GTX 335 Question

    Does anyone know if you could potentially use a single GTX 335/345 in two different airplanes? Could I purchase one unit that is capable of being programmed with tail number and then move them from one airplane to another? I've got a Cessna 172 that needs an ADS-B capable transponder and I'm working on building a IV Classic that will need one as well.

  5. #5
    Senior Member aviator79's Avatar
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    Default Re: Garmin GTX 335 Question

    Quote Originally Posted by Hoenshell View Post
    Does anyone know if you could potentially use a single GTX 335/345 in two different airplanes?
    You can edit the Fight ID pretty easily in the GTX 335/445. Swapping the hardware would be the bigger inconvenience.

    Edit: I just read the Garmin manual and the only catch is that by default, the flight ID is not editable. A Garmin-authorized installer can configure the unit to make the Flight ID editable, in which case it is easily edited directly on the unit.
    Last edited by aviator79; 05-30-2018 at 06:46 AM.
    --Brian
    Flying - S7SS

  6. #6
    Hoenshell's Avatar
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    Default Re: Garmin GTX 335 Question

    I'm thinking for $3k to $5.5k (since I need the GPS) that I might be willing to put up with the inconvenience for a while.

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