GPS Calculator is a Swiss army knife tool for working with GPS coordinates. It is free and has no ads. The new version released today is completely globalized and localized to English, Russian and French.
Based on most recent 2004 revision of the world geodesic system earth model, this app allows you to accurately project locations on earth surface, calculate distances and view real geodesic shortest lines on a map. It also does GPS coordinates conversion between different formats; calculates area of any closed polygon; allows you to access detailed GPS settings and manage favorite locations; reverse and forward geocode; and with the help of the large database of build-in locations works even offline.
If you would like to know more, head in directly to windows phone marketplace and read the more detailed description in Marketplace here.