"Stan Gosnell" wrote in message
The 'preferred' option is to have a loc frequency
automatically force the NAV/GPS switch to go to nav mode.

Well, maybe preferred by some, but I may want to tune in the
localizer while I'm a long way out, getting ready for the
approach, but navigating on GPS until I'm inbound, or at least
on vectors. Forcing VOR mode just because a localizer is tuned
is simply a stupid way to do things.

Agreed. My Garmin 300XL is setup to force the switch and it is a procedural
pain for approaches with with course reversal.

And if you switch to NAV mode while GPS is in Hold mode, the moving map goes
a bit crazy (I guess it's looking to the indicator for intended direction
info but it's been disco'd).

May be time to go back and have it configured to 'non-preferred' mode.