In principal - position the traveller unit in a run lane. Hook up the equipment to the hydrant, pull out the hose to the desired length (always leave one or two rolls on the reel). Start the pump, set the travel speed to deliver the desired application rate and the desired set time (usually 8-11-12 hours per run). When the run is completed, the traveller has to be moved into the next position (next hydrant), the hose and gun cart/boom has to be pulled into the field.