Automatic datum conversion is built in, but can be overridden using this interface. As it name implies, this interface is designed for high performance, real time, conversions. Projections are routinely added, call for the latest information. In normal usage, datum conversions are automatically applied to the intermediary latitude and longitudes produced by the coordinate system conversion process. CS-MAP automatically selects the most precise technique appropriate, and as many as is necessary, to accomplish the datum shift required.
End users refer to coordinate systems by key names.
Thus applications become easy for non-technical personnel to operate reliably. Applications rarely, if ever, concern themselves with datums as CS-MAP handles this automatically. Applications rarely, if ever, concern themselves with ellipsoids as CS-MAP handles this automatically. Numerical results are identical to the government sanctioned program in all cases. To users of CS-MAP based applications, NAD83 is a single entity.