Patent ID: 8375882

Claim:
A system for ascertaining field position comprising: first and second wheels, each being substantially planar and round, each having inner and outer surfaces; the first wheel having a relatively smaller diameter and being rotatably attached to the second wheel such that the outer surface of the second wheel is adjacent to the inner surface of the first wheel; wherein the first wheel being marked on the outer surface thereof, and further being marked with 120 notches equally spaced around the outer periphery thereof, the first notch comprising a first arrow originating from the middle of the first wheel, the arrow being identified as the line of scrimmage, each of the remaining notches being numbered in increments of 1, beginning with 1 up to 99, then in descending order from −20 to −1, every fifth number being in a relatively enlarged font and radially offset inwardly from the other numbers, being marked with a second, clockwise oriented, arrow originating from the first arrow and being marked as “yards gained”, being marked with a third, counter clockwise oriented, arrow originating from the first arrow and being marked as “yards lost”; wherein the second wheel being marked on the outer surface thereof, and further being marked with 120 notches being equally spaced around the second wheel and each originating from the center of the second wheel and terminating near the outer periphery thereof such that a portion of 101 consecutive notches are viewable, the 101 consecutive notches being marked starting with “goal” then a numerical indicator every fifth notch from 5 to 50, then in descending order from 45 to 5, the one hundred and first notch being marked as “goal”.