>>63937140
i'm probably too retarded to explain properly but it's basically a live velocity vector continuously adjusting the movement

you know how in most games aiming means moving the mouse a delta amount to move the on-screen crosshair a delta amount? well if you'd need to target a moving object in a certain direction, following it would require continously moving the mouse in that direction and also lifting it up and dragging it back to the other side when you run out of mousepad space
but you can improve precision and limit mouse movement if instead you click-drag that arrow in the lower part of the screen to indicate angle and magnitude, so the direction the arrow is pointed at is where to continuously turn to and how long the arrow is means how fast the turn will be, and if you let go it just stops all movement