If you HAVE to mark a quilt....
This is one of my TOP choices.
Painter's tape and a nice long ruler.
I've probably mentioned it before...
but it's worth repeating.
I'm finally getting around to getting it DONE.
Begin in the middle of the quilt and work out to the edges.
Just WATCH your speed!
If you go TOO fast.....
That walking foot will
COMPLAIN.
:/