Warren,
The radio is setup for Nav1 to have a standby that is set in Nav2, with a Swap Freq switch just below Nav2 dial.
There is also a swap switch in the center of the radio that swaps between Nav1 and ADF2 using the Radio compass.
This is the Radio setup in the cfg for the wheeled version:
[Radios] // available, standby frequency, has glide slope
Audio.1 = 1
Com.1 = 1, 1
Com.2 = 1, 0
Nav.1 = 1, 1, 1
Nav.2 = 1, 0, 0
Adf.1 = 1
Adf.2 = 1
Transponder.1 = 1
Marker.1 = 1
You can turn off the Nav1 standby by changing the Nav.1 to 1,0,1.
Or, deactivate the Nav.2 by changing Nav.2 = 0,0,0
Nav.1 = 1, 1, 1
Nav.2 = 1, 0, 0
This is the way the amphibian was set up in the aircraft.cfg; it may be less confusing for you:
[Radios] // available, standby frequency, has glide slope
Audio.1 = 1
Com.1 = 1, 1
Com.2 = 1, 0
Nav.1 = 1, 1, 1
Nav.2 = 0, 0, 0
Adf.1 = 1
Adf.2 = 1
Transponder.1 = 1
Marker.1 = 1
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