This morning I swapped out my ADSB-470 for the new dual channel ADSB-472. If your ADSB-470 is installed according to the Phoenixair LOA, it's actually quite easy to do. So, for those of you who are contemplating this, let me describe the process.   You simply unplug the old unit's DB-9 serial cable and antenna and take out the mounting bolts. The trick is to find an offset Phillips screwdriver for the inside of the glove box. Keep the bolts and locknuts for reuse. Reconnect the new un