Portable navigation apparatus for indicating present position on a map with indicated reference latitudinal and longitudinal lines based on surveyed present position data

摘要

A navigation apparatus is provided for surveying the position of the apparatus with such surveying unit as a global positioning system (GPS), to have respective figures of reference latitudinal and longitudinal lines X and Y displayed on a display device and, at the same time, to have the latitude and longitude of the position to be indicated by a present position mark of the apparatus calculated in accordance with a preliminarily set scale of reduction of a map utilized. Then, the user places the apparatus on the map so that the latitudinal and longitudinal lines X and Y displayed on the apparatus will coincide with corresponding latitudinal and longitudinal lines on the map, and then the present position can be recognized by the user by means of the present position mark of the display device on the map.