The Loosely Coupled integration method of a satellite and microelectromechanical (MEMS) strapdown inertial navigation systems (SINS) for the automotive vehicle gas been developed. This method allows the continuous estimation of linear and angular parameters of a automotive vehicles in real time with a sufficient accuracy. The realized method is universal for any of the inertial sensors lower class of accuracy and accordingly the cost. It has no problems with convergence and requires a fundamentally lower computational costs in comparison with algorithms, based on the stochastic optimal filters. Thus it is possible to effectively integrate the rough and relatively inexpensive MEMS SINS with the satellite navigation system. So the possibility of mass use of integrated inertial-satellite navigation systems in automotive vehicles has been realized. The practical application of the developed method for the integrated inertial-satellite navigation systems will greatly simplify the analysis of the emergency functioning of a automotive vehicles and conflict analysis in the case of several automotive vehicles. The results of simulation modeling and pilot experience are given, which confirm the efficiency of the synthesized method.