Abstract: A method of recording, into a data base of a navigation and positioning system, of geographic data of geographic places selected in a predetermined geographic zone, by selecting two points on a geographic map of said zone, defining these points by their geographic co-ordinates and by their position co-ordinates on the map, establishing the relationship between the geographic and position co-ordinates, defining the points to be recorded by their position co-ordinates, calculating for these position co-ordinates from the relationship, the geographic co-ordinates and entering the latter into the data base.

Abstract: A method and a device for the radiolocation of a vehicle carrying said device, wherein the radiolocation is performed by measuring the differences between the times for receiving radiofrequency signals transmitted by two transmitting stations geographically far away from each other, of at least one group of stations, each group comprising at least two transmitting stations including one master transmitter-forming station and at least one slave transmitter-forming station controlled by the master transmitter, each station transmitting a series of close electric pulses which are time-shifted in a predetermined way with respect to the series of pulses transmitted by the other stations, during a predetermined period of time, the method being characterized in that the acquisition of the signals and the measurement of the difference between the times for receiving the signals transmitted by transmitting stations of two different groups are performed in a unique receiving channel by performing the acquisitions and m