Jim:

FYI: I saw an advertisment on an online avionics shop (like Eastern Avionics or JA Aircenter or one like those, sorry I can't remember which one) for a GX 60. Apparently, the first units out had a com that was NOT IFR certified like you discussed above. However, they now have a patch for those units that allows the com to be IFR certified. Also, the later GX 60s did not have that restriction. So, know that there is a "fix" for your com if you want one.

Keven
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Magic Flight Review