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Thread: GPS Not Recieving External Data

  1. #1
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    Default GPS Not Recieving External Data

    I am having an issue with my Garmin GDU375. It has an error message of "Not Receiving External GPS RS-232 Data Using Internal GPS flight plan for navigation"

    I have tried replacing the GPS antenna. The Trutrac autopilot is also displaying a NO GPS SIGNAL. I assume since the GDU 375 is using internal vs external antenna.

    The internal GPS works well, just have lost capabilities.

    Any thoughts or ideas?

    Jeff Mickler

  2. #2
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    Default Re: GPS Not Recieving External Data

    Quote Originally Posted by jmickler View Post

    Any thoughts or ideas?
    Here are my thoughts.

    Your GDU375 seems to think it should be getting a GPS signal from another GPS unit (over the RS-232 port), typically a separate panel mount GPS.

    Our aircraft don't have a separate GPS unit, and use the internal GPS.

    Section 4.7.7 of the installation manual discusses how to configure the RS-232 ports.
    Chuck Hull
    L70 Agua Dulce, CA

  3. #3
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    Default Re: GPS Not Recieving External Data

    In think you are correct. Do you know what the values for the rs232 com1 and 2 Should be.

  4. #4
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    Default Re: GPS Not Recieving External Data

    Quote Originally Posted by jmickler View Post
    In think you are correct. Do you know what the values for the rs232 com1 and 2 Should be.
    I've never done this, but my guess is they should all be set to 'None'.
    Chuck Hull
    L70 Agua Dulce, CA

  5. #5
    Administrator Pete D's Avatar
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    Default Re: GPS Not Recieving External Data

    The GDU 375 communicates with the Garmin SL40 COM, Dynon D180, transponder and if equipped the Tru Trak auto pilot. I posted a photo of the programming settings for the RS232 ports for the factory options here:

    http://www.cubcraftersforums.com/sho...-on-Exec-Panel

    Since the auto pilot is a post-cert option it isn't shown on the production line SOP for programming the GDU 375. Typically it would be on the unused RS232 port 3. If I remember right that requires the setting to me "NEMA out" for RS232 port 3.

    Try those settings and that should help.
    Pete Dougherty
    Customer Support Manager
    Cub Crafters Inc

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