Thanks to all for the Stratux info. But as a Canadian that only gets to fly to the USA every couple years I really have no need for an adsb unit. Besides, a couple (maybe 3)years ago when the Raspberry Pi/Stratux thing was getting off the ground, one of the Cessna Pilots Society members bought a bunch of components at wholesale to make up Stratux units. I purchased one from him but have never had the chance to use it yet. It's older now, no gps and only one frequency but it will do me.