The conversion of coordinates from New Zealand Map Grid (NZMG) to New Zealand Transverse Mercator 2000 (NZTM2000) is a three-stage process:
- De-project NZMG coordinates to NZGD1949 geographic
- Convert NZGD1949 geographic coordinates to NZGD2000
- Project NZGD2000 geographic coordinates onto NZTM2000
A single set of equations to directly transform coordinates between projections is not available.