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Sorry Ernie, I did not take the time to think about this one and put it into something that made some sense. But Ok here we go.
In normal NAV mode the 400A takes heading information which on a HSI is provided by the Course (yellow arrow with the L/R bar in the centre on the King system).
Left/Right is provided by the NAV system to provide track error.
All or most GPS provide a track error signal that can be displayed on a standard CDI for track error, this left/right can be wired through a switch and you will be able to either use NAV or GPS. However you will have to use the No1 NAV system as this supplied the CRS error signal.
Hope this make sense
Regards
Pete
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