RockWorks requires that you define the coordinate system and units for any spatial data (map X and Y coordinates) listed in the datasheet. This is a 2-step process:
- Specifying the coordinate system and units for the columns.
- Specifying the coordinate system details.
- Open the datasheet you wish to edit, or create a new datasheet.
- Define the coordinate system and units for the columns:
- Define the coordinate system details.
- Click on the Coordinate System tab.
- Define the projection information. (See Coordinate Systems for more details.)

- For UTM coordinates, you'll need to define the Datum and the Zone.
- For State Plane coordinates, you'll need to define the Zone.
- For Local coordiantes, you'll need to define the reference longitude and latitude, if known. (If not known, just set these to 0 and 0.)
- If you have chosen a Custom Projection, use the Custom Parameters button to set up projection details.

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