The most important thing besides the length is the starting direction of the ball when putting. A golf hole is only 10.8 cm wide to sink the ball in the hole. Depending on the length of the putt, a maximum deviation of the start direction is required:

1 meter = 3.09 degrees

2 meters = 1.55 degrees

3 meters = 1.03 degrees

4 meters = 0.77 degrees

5 meters = 0.62 degrees

6 meters = 0.52 degrees

With the Putt Improver, this maximum lateral deviation can be trained through the different levels of difficulty and gives a direct feedback if the ball has just been started.