I gotta agree with you. I also have a certified GPS in the pannel. DME, ADF, (It might even work I'm not sure) Glide slope, and totally agree my yoke mounted 396 is the single most usefull device I have. The XM package, even though minutes old, gives me tons of info at your fingertips. The freq's, nrst, music. TFR's. Unbelievable tool. Mine is hard wired with the voltage alarm, and a five hour battery backup. Kinda makes you wonder the future?