unlock code is all you need.  The offline error is 0 or maybe 1 inch on straight lines. You can see that it is xte 1 inch to the left in the pic.  Mine is on a MT cat and it will grab the line very fast.  Have not drove a wheeled with autopilot.

You can change aggressiveness from the "run" screen.  You can nudge and shift patterns from the run screen.  Offsets and others are on the setup pages.  Saving guidance patterns is easy.  I forget how many spaces you can save, but you can geive them names, like "North Head" or "East Fence". YOu should see the Save button and Reset button in the pic.  Nudge is on the left side. and the autosteer engage is on the bottom right.  I ordered a foot switch to activate the autosteer but he must have forgot about it.

I think you would be very happy with the autopilot except the mobility as it is fixed to the tractor.

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