Dear all
I'm experiencing a problem. When GNS 530 is on can't switch in C 172(installed by default) between GPS/NAV e.g. during ILS approach.
When 530 is off then it's no problem.
GNS 430 doesn't affect it neither when it's on or off.
Simpy when 530 is on can't use radio aids to follow glidslope.
Any idea what may be wrong?
Martin