Welcome adigreen!
First I have to mention, that LibreCAD and Surveying are not best friends. The big numbers from coordinates, in relation to property size entities leads to some issues, where tools don't work as expected. This is a matter of math, namely rounding errors, which can't be solved easily.
A workaround for these issues is to offset the drawing to get coordinates with not more than 4 pre-decimal digits.
Concerning your problem I have two ideas.
The
Read ascii points plugin can import X/Y coordinates and draw points or lines. So you have to convert your grid system positions into appropriate X/Y coordinates, which you can then import with the plugin.
There is sadly not much documentation for the plugin, but I think it's not too complicated and with some trial and error you should get into it. Maybe Excel or Calc can do this easily and a CSV export is probably what the plugin can read.
See
https://docs.librecad.org/en/2.2.0_a/ref/menu.html#pluginsThe other idea is explained in the wiki, but might be a bit more complicated. When you have the coordinates, you can use the pseudo scripting technique to draw circles at the desired locations.
The reqirements for the file are more pretentious, it has to use valid command line commands to draw the circles.
https://wiki.librecad.org/index.php?title=Pseudo-Scripting_With_ExcelFor both solutions I think a well-conceived Excel/Calc spreadsheet can automate the process and make the creation of the drawing reproducible in case of errors.
Good luck
Armin
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