It has recently been determined that the East Australian Current swings away from the Australian coast at 32° south latitude flows east across the Tasman Sea past the northern tip of New Zealand. As a result this large current may have a significant effect on sound propagation conditions near the north island of New Zealand. Sound propagation predictions are obtained using a multi profile modelling program. First, comparison is made between sound crossing the current and sound propagation in a normal subtropical water mass. The relative importance of thermal structure, bottom slope and bottom absorption are then determined for current flow near the continental shelf and bathymetric features such as the Lord Howe Rise and Three Kings Islands. Finally, results are compared to data obtained during Project Span Three.