Check out OziExplorer at WWW.Oziexplorer.com . Use it with your MapTech
charts. The price is right being shareware at less than $100 for a license.
I have been quite satisfied with it. There is even APIs for those so
inclined.

HTH

Vic

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Victor Fraenckel - The Windman
victorf ATSIGN windreader DOTcom
KC2GUI