Pan Mode – Tilt and Roll are fixed and camera is permitted to pan left or right depends on the direction the gimbal body is pointed. The remote control can only move the camera up and down.
Follow Mode – Camera can pan up, down, left, and right depends on the position the gimbal body is placed. However, the remote control cannot adjust any movement in this mode.
Lock Mode – Pan/tilt/roll axis are all locked. The remote has control to move the camera up, down, left, and right. Please understand that lock mode is not fixed all of the time due to planetary rotation. For more details, please check this article: https://removu.zendesk.com/hc/en-us/articles/360033462574-Why-does-my-camera-slowly-drift-to-the-side-in-Lock-Mode-