Here's what the panel looks like at present. I think the simplest and easiest route to compliance is to swap the KT-76A for GTX 335. A downside that I can see is that it requires a cable to run for the WAAS antenna. Still, I can probably install everything myself and get someone to sign it off. Last I checked, it was $250 and no multi-month wait -- provided that I don't have to disconnect the static from the encoder, which I don't need to do if GTX 335 is compatible with my encoder. However, I'm stopping one last time to check if the UAT land offers any interesting options. Is there something out there that can replace the Apollo? I understand that I would need to add 2 antennas: UAT and WAAS GPS, but then I am getting rid of the Apollo.