Traffic data from the GTS 800 can be sent through the Flight Stream to ForeFlight Mobile, but a GDL 88 must be installed between the GTS 800 and the Flight Stream to translate the traffic information. The GTS 800 does not 'talk' to the Flight Stream directly, so the GDL 88 must serve as the processing hub that takes in all of the traffic information and sends it to the Flight Stream.
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