The Carlson Software CR2 and CR5 instruments utilize ATR (Automatic Target Recognition) functionality searches to for a prism and precisely position the scope.
Remember that the crosshairs may not, and do not need to be exactly positioned on the center of the prism… this does not matter. The ATR measures the deviation between the center of the prism and the crosshairs to display the correct angles in the measurement screen.
This speeds up the overall measurement process. A typical application for the ATR is monitoring; where the use of the ATR saves the surveyor time by accurately and automatically measuring to the center of prisms.