Thank you, Rolig! I checked your script. If this still works, it means I have been doing something wrong with mine because my script is similar to yours. I had used it for a long time until one day, it stopped working. The whole map turns dark. I thought it was the error from LL or gridsurvery because another one I bought from MP also does not work. The map also does not show. It only displays dark color.
Anyway, I'm rechecking. Thank you again