NAVIGATE remarkets Australia Post Postcodes boundaries that have been released by PSMA Australia in the 2007 release. Both postcode boundaries and postcode centroids are available.

Postcodes are Administrative Areas developed by Australia Post to facilitate the efficient delivery of mail. A postcode may be classed either as an area or a point-type postcode (eg. Post office box).  A postcode may have many polygons defining its boundary. The original polygon data supplied by PSMA has been clipped and infilled by NAVIGATE to coincide with ASGS state polygons. PSMA boundaries within each state have been honoured except where adjustments have been made to remove voids and overlaps.