Software and electronic and computer hardware used in geophysical surveying; Software and electronic computer hardware used in the creation and interpretation of seabed and river-bed maps and charts and associated equipment for hydrographic and geophysical survey; imaging sonar; imaging seismographer; computers, computer monitors, video monitors, electronic sensors, transmitters and receivers used in sonar and seismic imaging; Software and computer hardware used in the collection, processing, display and recording of data from underwater sensors in imaging systems, such as sonar and seismic systems; Software and electronic computer hardware used in the measurement of motion, attitude and position of surface watercraft, namely ships and boats and undersurface watercraft, namely submarines; Sonar equipment and parts thereof electronic computer hardware and software used in the imaging and measurement of seabed and subseas structures; Printers used in depicting seabed and river-bed maps, images and charts