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Before I get too involved in lots of wiring changes and investigation, I would like to know about anyone elses experience in using a GNC255 in a Dynon D180/HS34 environment. My specific question is whether you can use the sat nav connection to the GNC for look up of local airfields etc. As the GNC only has one serial input, how can that be shared with the HS34 which uses the connection to drive the HSI and then a GPS to update the Comm database?