Hi Mason,
Welcome to the Autodesk Forums.
To add >>>EPSG:6703<<< to MAPCSLIBRARY here's the steps.
Use command MAPCSCREATE >> Coordinatesystem. (Also available in the Planning and Analysis Workspace ribbon.) A wizard will walk you through.
1. Create Coordinate System >> Create a Coordinate System Definition. Next.
2. Specify starting point >> Start with a coordinate system. Next.
3. Specify Coordinate System >> Create a new Coordinate System Type: Projected. Next.
3a. Create Coordinate System. Next.
3b. Specify Projection. Next.
3c. Specify Common Parameters. Next.
4. Review Coordinate System. Finish.
Exit Civil 3D. Restart. Your shiny new WGS84.TM-60SW Coordinate System should be in MAPCSLIBRARY.
Dave









Dave Stoll
Las Vegas, Nevada

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2025