I found that all INPA are not created equal. See
this post.
Haven't done much coding. Enabled the 3 blink turn signals with SSS/Progman.
The rest of my car is already pretty much the way I want it, so I mostly use it for occasional diagnostics.
Just recently discovered NavCoder, thanks to ANILE8. Does much more than just Nav, or at least it will if you pay 25 quid to register it.