Use the left throttle stick to lift the vehicle slightly off the ground / move the vehicle forward slowly. The vehicle should hover in a stationary position or drive in a straight line.  If it is drifting, picture yourself in the cockpit or driver's seat.  From the pilot’s or driver's point of view, which way is the vehicle moving / drifting / spinning / pulling?

Left or Counterclockwise:
Turn your trim dial clockwise. Continue turning until movement is fully corrected.

Right or Clockwise:
Turn your trim dial counterclockwise. Continue turning until movement is fully corrected.

 
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