A directiondistance mark is displayed on a map, wherein the directiondistance mark shows a direction line indicating a direction, with a reference point of a map screen being located in a center, a plurality of equidistant circles with the reference point being located in the center, and a distance from the reference point indicated by each equidistant circle. The keyboard module is moveable between at least two allowable positions with respect to the host unit, wherein a first allowable position of the at least two allowable positions results in the keyboard module substantially covering the display, and wherein a second allowable position of the at least two allowable positions results in the display being at least partially exposed. Upon completion of the automatic pre-setting, the CPU calculates an average value of the frequency of deviation amounts of respective channels, and stores the average value in a memory as fine tuning data.