This thesis was carried out following an internship at Wirail. The core business of this company is the development of control units for the telemetry of moving vehicles. The control units I worked on are equipped with modems for internet connection, a microcontroller, a touchscreen display, and a GNSS receiver. Given the rapid evolution of precision agriculture, the aim of the thesis is to assess the quality of the GNSS receiver. The one installed in the control unit is a GNSS receiver capable of operating in SBAS (differential) mode, achieving an accuracy of 1 meter. However, today there are receivers that implement different correction techniques, reaching centimeter-level accuracy.