Tractors and harvesters that steer themselves would have sounded like science fiction 10 years ago, yet today there are several systems which can effectively guide machinery. Tractors and more recently cotton pickers can now steer themselves along a row with remarkable accuracy. Automatic guidance is provided by either video, global positioning or mechanical means with costs ranging from $7100 to $80,000. Most current systems are geared up for row crop situations, as much of the development work was funded by the Australian Cotton Research and Development Corporation But one of the leading Global Positioning-based systems has been used in broad acre farming for four years and it is expected that more of the technology will be adapted for cereal and pulse production in the not too distant future.