If you have ArcGIS by ESRI installed on your computer, you can now work with the Geographic Calculator right in the ArcMap window. Use the Blue Marble toolbar to launch the full version of the Calculator, run point to point conversions in a custom window, define custom systems or otherwise leverage the Blue Marble Geodetic data source, convert the map window with the calculator, load data with the calculator, or view a converting point file in the ArcMap window. Users can also use datum shift envelopes in the Calculator to guide and control coordinate transformation work in ArcGIS.