Aimed at the problem that the navigation devices fail to access the network and the navigation devices communication format in confusion in the process of designing the intelligent navigation device remote monitoring system, a special navigation device interface system is designed to make navigation equipment able to access the internet based on the idea of networking and taking the embedded microprocessor as the master chip. Through the development of a unified navigation device output information protocol, the data format of navigation device is standardized. The experimental circuit is utilized to test the interface system, and the hardware and software flow chart are discussed in detail. Experiments show that the interface system enables the navigation devices to access network and the problems of navigation devices communication format confusing are solved.