Spiral wave front sonar is a non-imaging, active sonar technique for remote target localization. It operates by transmitting in rapid succession a leading reference signal, a spiral signal whose phase varies by 2π over the transducer's azimuthal plane, and then a trailing second reference signal. Individual echos can be analyzed for range by time-of-flight, radial velocity by measuring the Doppler effect between the leading and trailing reference signals, and bearing by computing the phase difference between reference and spiral signals across a range of frequencies on a single receive channel. In addition, the spectral response of the target is available for classification algorithms. A prototype compact spiral sonar system (spiral transducer array, hydrophone receiver, amplifiers, and data acquisition) was developed and built for use on a Unmanned Underwater Vehicle (UUV). This talk will focus on analysis of results from initial experiments with this system conducted at NRL's Chesapeake Bay Detachment. Target bearing, range, and radial velocities are computed for a number of targets detected within the field. In addition, several targets were tracked over multiple sonar pings. [Work funded by the Naval Research Laboratory.]