The GDL 39 (or 39 3D, GDL 51/52) can output GPS data to any Garmin portable device or Garmin Pilot app. I am not clear as to whether it works with any third party apps. It might.
This same concept works both ways. A Garmin portable device or G3X flight deck can send its GPS position information to the GDL. In this configuration the GDL doesn't need a view of the horizon or an external antenna for GPS data. Handy for a hidden installation.
In so far as the iPad purchase I suggest the cellular version if only because it has an internal GPS. Can't have too many backups. I bought my 4G iPad Mini without a cellular data plan and haven't had a need to activate it. I do use the unit "stand alone" on occasion and appreciate the built-in GPS. I only use the iPad for flight planning and in cockpit with Pilot, iFly and FlyQ EFB. I don't use it for internet, email etc. If you ever wanted to activate a data plan it can work in the air in many places at lower altitudes so that could be another reason to get the cellular version. I ferried a Cub from Florida to Texas with my Mini using its internal GPS. Also as long as I stayed over Interstate 10 I had data service with Verizon on my Android smartphone.
Jim
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RV-8
(a few more airplanes too)
Last edited by jliltd : 04-28-2018 at 06:31 AM.
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