Method to determine the orientation of the azimuth direction of a navigation apparatus

The method involves a transmitter station (S) transmitting an omnidirectional beam used by the receiving navigation device (E) to determine the angle between the main direction and the direction to the transmitting station and a directional beam to another in the azimuthal plane containing a function giving the start of its instantaneous circulation position in a fixed geographical direction. An angle is derived and summed with the first angle. The method involves a transmitter station (S) transmitting an omnidirectional beam used by the receiving navigation device (E) to determine the angle between the main direction and the direction to the transmitting station. The same station transmits a directional beam to another in the azimuthal plane containing a function giving the start of its instantaneous circulation position in a fixed geographical direction. This function is evaluated to derive the angle from the fixed geographical direction to the line between the navigation device and the transmitter station. The sum of the angles is summed to obtain the angle between the main direction and the fixed geographical direction. Independent claims are also included for the following: an application of the method to a journey planning system.