Graphtec can read skew, so why bother? I once looaded something really, really crooked just to test. I'm talking 5-6" off... It read one mark... couldnt find the second and asked me to manually find it... then it found third, and fourth by itself, and proceeded to cut perfectly. So long as your not an inch or so off, which is pretty hard to do... It should find all the marks easily.