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This article discusses the design and implementation aspects of ACP 245, a telematic communication protocol, in the vehicle location equipment. The ACP 245 is an open protocol created by DENATRAN (National Traffic Department) to meet Resolution No 245 of CONTRAN (National Traffic Council), which made mandatory the use of antitheft equipment in new vehicles coming out of factory, domestic or imported. The Resolution No. 245 initiated a process of adaptation of products and services - within the operational context called SIMRAV (Integrated System for Monitoring and Automatic Vehicle Registry) - outlined by DENATRAN in partnership with automakers, vehicle location equipment manufacturers, SIM Cards manufacturers, monitoring services providers and mobile communication operators among others.

This work presents the lateral vehicle position detection algorithm developed for MGS project (Magnetic Guidance System), which controls the lateral position of a vehicle based on its deviation in relation to a reference magnetic track. Initially, the general requirements which guide the algorithm operation are presented, including constraints imposed by real world. Next, the algorithm's context is described, including the architecture of the system where de algorithm operates, the information supplied to the algorithm and the information got in return. Finally, the algorithm itself is presented in terms of the operations executed over the input data to determine the desired results.