Abstract. The problems of formal description of the functional stability of navigation and information systems are considered using the concepts of the quality of the functions performed by them, taking into account the status of available navigation fields and the mobile radio systems used. The navigation information system is an automated information management system designed to control one or more mobile objects based on processing of their location, traffic parameters and status. A graphic interpretation of the process of ensuring the functional stability of the system is presented. Ensuring the functional sustainability of the navigation information system is reduced to the process of maintaining the current quality vector for performing the system functions in the required area.

Keywords: information navigation system, functional stability, reliability, survivability, safety

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