Vectorputt Golf Ball Marker and Alignment Tool - USGA approved for professional and amateur play. 1) Mark your ball on the green with the wide side of the vector diagram facing the hole. 2) Read the green to determine how much "break" (amount of curve) to allow for in your putting attempt. 3) From a few feet behind your VECTORPUTT, determine which vector line is the start of the "putting line" you have identified. 4) Replace your ball on the green with your ball's imprint (or line you mark) parallel to the vector line you selected (see picture above) 5) Prepare to make your stroke with the confidence of knowing the ball's imprint is on your putting line. Golf ball marker; golf alignment tool; putting practice; putting alignment tool