Abstract: A soil cultivating apparatus including a tractor towing a row cultivator by means of a three-point linkage. The row cultivator includes a fixed portion and a moveable portion having soil scarifying tools. The movable portion is laterally moveable relative to the fixed portion by means of linkages and is effected by a hydraulic actuator under control of tool bar control systems which is able to determine the position of the moveable portion relative to the fixed portion by means of a sensor. Mounted upon the moveable potion is a DGPS antenna GPS receiver that forms part of the control system. The control system has a microprocessor which operatively executes a stored program. The microprocessor receives data from an intra-rig sensor and from the GPS receiver specifying the absolute coordinate of the movable portion relative to the earth.

Abstract: There is disclosed a guidance assisting apparatus for aiding in the guidance of an agricultural vehicle (5) over arable land. The apparatus makes use of a GPS positional receiver (81) in order to determine if the vehicle (5) is overlapping previous passes of a paddock thereby reducing the likelihood of strips of land being double processed or left unprocessed. Guidance may be provided by a visual display or by power assisted steering.

Abstract: A soil cultivating apparatus including a tractor (2) towing a row cultivator (4) by means of a three-point linkage (6). The row cultivator (4) includes a fixed portion (8) and a moveable portion (10) having soil scarifying tools (18a-18n). The movable portion (10) is laterally moveable relative to the fixed portion (8) by means of linkages (12a-12d) and is effected by a hydraulic actuator (22) under control of tool-bar control system (20) which is able to determine the position of the moveable portion (10) relative to the fixed portion (8) by means of a sensor (24). Mounted upon the moveable portion (10) is a DGPS antenna (26) GPS receiver that forms part of the control system (20). The control system (20) has a microprocessor which operatively executes a stored program. The microprocessor receives data from an intra-rig sensor and from the GPS receiver specifying the absolute coordinate of the movable portion (10) relative to the earth.