Everything from the front sideline and the front hash is right, so if you count your steps from there you'll be on your dot. Everything from the back hash and the back sideline is off by a step and a third. You cannot evenly divide a football field into how ever many steps there are on a drill page. This is common knowledge in the Drum Corps world, and if you call yourself a good marcher you should know this.
If you take a diagonal and half of it counts (with a proper 8 to 5) from the back hash and back sideline and the other half counts from the front hash and the front sideline the diagonal will be off by a step and a third in the middle. All good techs know this and teach it when learning drill, ask anyone in a top Div I corps or people in Academy, ECJ from 04, Spartans. How do you think BD, Cavies or Cadets do drill? They use the step and a third and if they didn't there drill wouldn't be as good.
This is another big problem with Dot hunting/shopping/whoreing, lots of people don't know about this. So if the line is being set from the front and they a stepping off from the front hash and a person in the back goes to their dots on the drill page and steps it off from the back hash............. they're wrong.
Not trying to rag on you or anybody, but you really can't call yourself a good/smart marcher if you've never heard about this or don't use this.