Roy Smith wrote:

What I don't understand about GPS is why some of them have synthetic HSIs.
One of the new features in the GNS-480 vs. the CNX-80, for example, was the
addition of a "NAV" page, which shows a picture of an quasi-HSI (quasi
because the numbers are showing track, not heading). What's the point?
You've already got a far, superior representation in the moving map. The
position of the aircraft icon relative to the purple line shows your course
deviation, and the *orientation* of the icon shows whether you're getting
better or worse. Displacement AND trend in one picture.

I find the NAV page on the 480 gives me more trend information in a quick glance
than the map presentation. I use it during approaches. Enroute I use the map.

DGB