"This paper documents the implementation and evaluation of a prototypical directional sound system to support navigation, which responds to movements of the head. This is achieved through the use of a head mounted compass. Head movements have been cited as one of the most influential auditory cues which serve to assist the localization of sound in space. The paper then goes on to describe a methodology for assessing the extent to which the system supports sound lateralization. Conclusions are drawn in section 7 whilst the raw data tables are presented in Appendix B. The area of psychoacoustics is an interesting and multidisciplinary one, encompassing a wide range of skills such as programming, psychology and digital signal processing."