Blue Marble Geographicsannounced thatMicrosoft Corporation licensed the GeoCalc.NET software developer toolkitto enhance and expand the data processing capabilities required to create Virtual Earth. GeoCalc 6.2 is an object-oriented, cross platform software developer toolkit designed for complex coordinate system definition and conversion in an easy-to-use interface. The tool utilizes an XML data source and provides the latest support for well-known text (WKT) coordinate system definitions for the Open GIS Consortium specifications. The human readable capabilities of the XML data source in GeoCalc are important for ease of use in geodetic development projects. GeoCalc has fully functioning dialogues that allow the user to define custom systems, ellipsoids, datum shifts and units without having to edit a text file. The tool supports coordinate system definition straight from TAB or PRJ files. (Blue Marble Geographics, Gardiner, Maine)