Johnson farms of Daggett have been experimenting with a global positioning system (GPS) unit on one of their tractors. The GPS unit actually steers the tractor using a link between the tractor and a series of satellites. A signal is emitted near the end of the field alerting the operator who manually turns the tractor and clicks the unit back on. The operator programs the width of the coverage area desired into the GPS display, shown to the right of the tractor steering wheel. The accuracy of the GPS eliminates overlapping during any field work, a cost saving that is significant in the days of high input costs of fuel, fertilizers, and sprays. Cutting down these costs could net an equipment payback in as short a time as one year, said the dealer sales rep. Johnson said about 10 percent less acres would be double-tilled using the GPS. The Johnson operate a dairy farm and raise much of their livestock feed.