An audio-based navigation system for determining a present location or position of a mobile device such as a smartphone within a venue. The system includes a sound system with a first speaker playing first audio content and a second speaker playing second audio content. The first speaker is positioned in a first space in a venue, and the second speaker is positioned in a second space of the venue. The navigation system also includes a mobile device with memory storing a database of fingerprints of a plurality of differing audio content. The mobile device includes a microphone for receiving an audio signal associated with the first audio content or with the second audio content. The mobile device includes a processor(s) selectively running software to determine the mobile device location in the first or second space using either fingerprinting or watermarking module by processing the received audio signal.