in these boxes, especially when the
design is done from the ground up and could include that functionality
with apparently not much additional work. '

The nav function of the G1000 is certainly the ground up though. Its
100% a GNS 430. If you look on the right side of the panel there is a
group of buttons that control the nav functions. These buttons are the
same as the buttons on the bottom of the 430 (OBS, Proc, etc). In fact,
the only difference I can find between the G1000 and the GNS 430 is
that when you do a course reversal on approach, you must 'unsuspend'
the 430 to begin the inbound leg, where the G1000 automatically does
this.

-Robert