It is correct that the GPS receiver can only provide the location of the antenna to the control system for the sprayer. However, the software responsible for turning the spray nozzle on and off can be calibrated based on the location of the nozzle relative to the location of the GPS antenna. Once the relative location of the spray nozzle is known, the software automatically converts the GPS signal into the position of the nozzle, allowing for on/off decisions to be made accurately.
FAQ #27244
If the GPS gives a position only at the antenna, how does a spray nozzle thirty feet away on the end of a boon know to turn on or off?
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