Map products, including charts and large-scale engineering drawings, contain a wealth of positional and longitudinal (time-referenced) information, available and cheap to produce for those who are constructing Geographic or Land Use Information Systems. If these map products are on stable based material and are not previously handled, the transformation of projection to digitizer coordinate systems would be a matter of determining scale, orientation and translation parameters. In this paper I discuss ways to transform projection coordinates to digitizer values, recognizing that the paper bases are not stable based. Test values are computed and compared for methods and results are interpreted with respect to the geometry of the operation.