The direction display device includes: a wireless communication section (48) to perform near field wireless communication; a barometric pressure measuring section (56); a converting section (41, 421) to convert barometric pressure into altitude; an orienta...

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...