OK, these guys are speaking my language. I have exactly the same issue re getting the NAV function to work, and I get the same result (it works) when I use MIK75s procedure. I change the PDF to LOC first, then the GTN750, then hit NAV on the AP, then change the PDF back to GPS, then change the GTN750 back to GPS. Whew!! Otherwise, this is a beautiful mod. Thanks guys!
JIm