(In so many words) I had a dealer install my GNX 375 back in January. My IA is putting in a GMA 345 audio panel and a GTR 225 com. I'd like to know what pins to use to output RS-232 to the GTR 225 to take advantage of the nearest feature for frequency lookup. Plus I'd like to have the GNX 375 interface with a KI 209 so I can navigate with GPS for IFR. Garmin refused to help and told me to take it to a dealer. I already had a dealer install it. I'm simply trying to interface it with my new audio panel, radio, and new to me indicator. Can anyone point me in the right direction to look? The dealer said they would send it to me, but we're going on 2 weeks at the moment. Thanks.