Multibeam mapping uses advanced multibeam sonar technology used for detailed 3D mapping of the seabed. The vessel-mounted multibeam sonar transmits a fan, or swathe, of acoustic energy across the ship track, then resolves multiple depth points across the swathe based upon the slant range and elevation angle of reflected echoes from the seafloor. These images were taken during various multibeam surveys conducted on the Great Barrier Reef and northern Australian waters.