The Navigator is a simple, easy to use, instantly effective eye training device that attaches to the shaft of any putter in a matter of seconds. It teaches the user to recognize and repeat a square putter face at address and at impact. In just 5 minutes of use, the Navigator reveals exactly why you're missing putts. The feedback is immediate, removing all guesswork from the equation. With repeated use, the Navigator will give you a drastic and lasting ability to make putts!