Peter wrote:

Sam Spade wrote


Forcing the scaling to 0.3 does not result in approach mode. Approach
mode includes approach RAIM and some additional accuracy that is not
apparent to the pilot.


Can you indicate how this additional accuracy is implemented?

No, I have been told this by one of Garmin's 400/500 avionics engineers.

I am not an avionics engineer. Those folks live in a different world. ;-)

So, if you fly an approach with 0.3 forced, and the approach
light/annunicator is not active, you are flying the approach effectively
in terminal mode.


Yes, I see that.