Abstract: A method of determining a position of a mobile electronic device with respect to a beacon is provided. The beacon transmits three or more radio signals having unique identifiers in different directions within a plane. The method includes receiving the radio signals and determining the received signal strength of each of the received radio signals. The method also includes calculating signal strength difference values for pairs of the received radio signals and determining an azimuth of the mobile electronic device relative to the beacon based on the calculated signal strength difference values for the pairs.