The direction the clubhead is traveling — left or right of the target line — at the moment of impact, measured in degrees. On a launch monitor, positive means in-to-out (rightward for a right-hander) and negative means out-to-in. Together with face angle it sets the shot's curve: a draw wants a positive path with the face slightly closed to that path; a fade wants the reverse. Well-struck shots generally live within a few degrees of zero — TrackMan cites a working range of about ±3 to 6 — while a persistent −6° or more is the fingerprint of the over-the-top slice. It's one of the first sim numbers worth learning, because it explains why the ball curves.

The direction the clubhead is traveling — left or right of the target line — at the moment of impact, measured in degrees. On a launch monitor, positive means in-to-out (rightward for a right-hander) and negative means out-to-in. Together with face angle it sets the shot's curve: a draw wants a positive path with the face slightly closed to that path; a fade wants the reverse. Well-struck shots generally live within a few degrees of zero — TrackMan cites a working range of about ±3 to 6 — while a persistent −6° or more is the fingerprint of the over-the-top slice. It's one of the first sim numbers worth learning, because it explains why the ball curves.