A radio receiver device of the present invention may be used in a navigation system mounted on an automotive vehicle. The radio receiver device includes a receiver for receiving radio waves, a detector for detecting field intensity of the radio waves and a display panel for displaying the detected field intensity together with a name of the radio station and its carrier frequency. The field intensity is classified into several intensity ranks. The intensity ranks are displayed on the display panel by colors or other marks which are easily recognized by a driver. The driver is able to select one station having proper field intensity according to his preference without sacrificing his concentration on driving.