Specifically designed for Whale Watching excursions. Built by Streamline Catamarans at Hervey Bay, delivered in June 2008. MV GRANT DORN, named after son of the owner, is shown at the stern, but vessel is always referred to as SPIRIT OF HERVEY BAY. Composite hull 24m x 10m. 245 passengers. Cruise speed 22 knots. Operates daily Whale Watching excursions from July to November, occasional Mary River excursions other months. Shown returning from Mary River 5½ hour cruise.