NCYankee wrote:
I haven’t had a need to fly an ILS since 2008.
I’m so pleased for you. Unfortunately, outside of your GPS utopia, there are many places in this world where LNAV/LPV etc cannot be flown, often due to excessive RF. Kuwait springs to mind, where Uncle Sam has some rather powerful antennae squiring out a lot of (intentional) noise. 
Peter wrote:
That’s why when flying an ILS I always have the GPS set with a DCT to the airport, in OBC mode
Why not just load the approach into the GNSS? Surely that guarantees that the magenta line will follow the ILS track very closely? (depending on circumstances you can put in the procedure or vectors.)
Peter wrote:
I know that hack works only for an airport which has one instrument runway.
21 at Prestwick is a fine example, and Schipol.
I am not sure the KLN94 displays anything useful for that. But, yeah, it may well show the final approach track line. I will try it next time. Perhaps the “vectors” option will show a longer line.
Timothy was right. The “ILS” procedure in the KLN94 GPS does display the runway centreline. It seems to draw a magenta line 30nm back.
