The Formulae on the grid spreadsheet [36.3 KB] can help you:
- radiate via grid bearing and distance from a known mark to generate coordinates for another mark
- calculate a join between a known mark and another mark
- account for geodetic corrections and terrain differences.
It’s optimised for the ACT (added 610 meters to the ANS semi-major axis length). You'll find more details about this in the parameters and notes tab.