Abstract: A method for acquiring azimuth information includes the steps of disposing a pair of planar antennas each having a hemispherical antenna pattern for GPS satellite signals back-to-back, parallel to each other and vertical, whereby each planar antenna forms a sky coverage area of antenna sensitivity that is a sky quarter-sphere in the direction the antenna faces; causing a pair of GPS receivers, one connected to each antenna, to scan signals transmitted by GPS satellites in the sky hemisphere; causing the GPS receivers to output respective channel statuses indicating reception of the signal transmitted by each GPS satellite in the sky hemisphere; causing at least one GPS receiver to output satellite azimuth for each GPS satellite in the sky hemisphere; discriminating the sky coverage area in which each GPS satellite that transmitted the signal is present, based oil a comparison of the channel statuses in the GPS receivers; arranging the results of the discriminating step in a ring-like sequence of a specific ro