Icom Garmon NEMA communication
I have having trouble with my NEMA communication between my Garmin 172C GPS/Plotter and ICOM M502A VHF. I have the GPS set to communicate on both port 1 & 2 at NEMA in/out. However, when I turn on the position feature on my VHF, I have the message "NO POS DATA". The two units are connected via a red rca plug. Any help would be greatly appreciated.