#$%^&*AU2009217477B220140130.pdf#####CONTROL OF PASSIVE, TOWED INSTRUMENTS Abstract of the Disclosure An automatic control system for passive, towed implements is described. The system provides a strategy for optimal control of a towed implement using a nudge input to an autopilot-controlled tractor. Implement path-tracking error, as measured by a GNSS receiver, is consistently corrected to zero.1/8 /l L2 Lo L1, 100 - - - - -- - -120- 115 12510 105 110 Fig. 1