The secondary monitor in the TrackMan shows you how you've delivered the club to the ball. The TrackMan system will give you a degree measuring how much you've used a certain path - this could be -1.2 for a right-handed golfer (out-to-in) or 7.5 (in-to-out). In a perfect world, it should be as close to 0 as possible, giving us a straighter ball flight with more distance and better trajectory.
The first of the three swing paths that you will see on our TrackMan simulators is out-to-in:
The club head travels from outside the target line, across it, and then inside the target line. In effect, the path of the club is travelling to the left of the ball-to-target line.
The second swing path is in-to-out:
The club head travels from inside the target line, across it, and then outside the target line. So the path of the club is travelling to the right of the ball-to-target line.
And the final swing path is straight:
The club head travels straight down the ball-to-target line as it makes contact with the ball.