Hello,
I need to create a custom coordinate system as the PNG94 / PNGMG94 zone 55 is not a default Civil 3D coordinate system. As the datum neither exists, I tried to export a coordinate system as xml including the datum data and then modify it, but I couldn't create the right syntax as it gives me an error when I try to import it.
Could you please help me, please ? The EPSG code is 5551 (https://epsg.io/5551).