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With the fields in the NFL marked as well as they are, it's pretty easy to keep the box lined up on the ball correctly. If the nose of the ball in not on the line, either the butt of the ball in on the line or the ball is half way between the lines, etc. so there is always a refernce point. Then all you do is look down at the chain as see if it's a long five or a short five.
Actually the HL has the worst view because he's between the box and the ball so he can't see it that well. NFL linesmen get out of the way and leave it to the box man to line it up correctly.
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