Under the "Geographical Reference" tab when looking at project propeties in Walls, there's a check box for "UTM/UPS Grid-relative" in the coordinates section.
I read the help section on it and I think I have a vague understanding of what it does now, but I'm not sure about the "why" questions and when I'd use that option to what effect.
What are some considerations on whether or not I'd want to use UTM/UPS Grid-relative coordinates? If I do use that option and claim that my map is corrected to true north, am I technically lying?