For the quilt I am working on today, I used a 1" wide ruler and drew my lines with a Frixion pen. I know many people do not like Frixion pens; but they will come off the fabric I am using. The quilt is for one of my daughter's foster children. It will be washed frequently and will not be exposed to cold that would make the marks return.
Sometimes, on dark fabric, I have marked with soap. I have also used the blue painter's tape.