A navigation equipment includes a user position observing unit 15 for calculating the position of the navigation equipment by using the pseudo range and position of each GPS satellite, and a pseudo range error, a user velocity and heading observing unit 16 for calculating the velocity of the navigation equipment from a measured range rate, the position of each GPS satellite, and the position of the navigation equipment, and a user heading searching unit 17 for, when a multipath error is smaller than a specified value, searching for, as the heading of the navigation equipment, a heading whose range rate, which is calculated from a relative movement between the navigation equipment when the navigation equipment changes its heading within a predetermined angle range and a GPS satellite, matches the measured range rate.