Delorme's Map Expert makes this a painless export. Some other programs require screen grabbing utilities. Fixing simply means entering the Latitude and Longitude of some known points on the map. From 2 to 30 points may be used, so various map projections or other distortions may be accomodated. The more points the better.
Opposite corners work best.
Any bitmap has a limit to the degree it can be zoomed in and out, and the creation of huge high resolution maps isn't practical from the standpoint of data storage. Even if it were, zooming out from a high resolution map is suprisingly destructive due to pixels vanishing. While road maps in vector format are much more useful on the ground, the scanned Sectional charts from Vista are well suited to use above the ground. They look great over several zoom levels, and contain sufficient details without being excessively large. Still, hang on to the paper maps, and don't depend on one single navi-widget.