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In a global positioning system (GPS)/self-contained combination type navigation system for a vehicle, the GPS navigation data are received by the GPS antenna of the navigation system which are simultaneously transmitted from more than 3 pieces of satellites inclusively. From the GPS navigation data,

In a global positioning system (GPS)/self-contained combination type navigation system for a vehicle, the GPS navigation data are received by the GPS antenna of the navigation system which are simultaneously transmitted from more than 3 pieces of satellites inclusively. From the GPS navigation data, GPS type velocity data is calculated, whereas self-contained type velocity data is calculated from self-contained type navigation data such as azimuth data and drive-distance data of the vehicle. Only when a difference between the self-contained type velocity data and the GPS type velocity data exceeds a threshold velocity, the GPS type velocity data is voided so as to determine the present position of the vehicle.

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A global positioning system (GPS)/self-contained combination type navigation system for a moving object comprising: self-contained type positioning means for acquiring self-contained type positioning information of the moving object; GPS type positioning means for acquiring GPS type positioning info

A global positioning system (GPS)/self-contained combination type navigation system for a moving object comprising: self-contained type positioning means for acquiring self-contained type positioning information of the moving object; GPS type positioning means for acquiring GPS type positioning information from GPS navigation data transmitted from a plurality of satellites arranged for constituting the global positioning navigation system; correcting means for producing a correction signal to be supplied to the self-contained type positioning means based upon the GPS type positioning information, whereby corrected self-contained type positioning information is derived from the self-contained type positioning means; present-position determining means for determining a present position of the moving object by processing one of said corrected self-contained type positioning information and GPS type positioning information, depending upon a reception condition of said GPS positioning information; map data memory means for previously storing map data required for navigating the moving object; and display means for displaying the present position of the moving object superimposed on the map data by receiving the output of the present-position determining means and the map data from the map data memory means.