TOPNAV

electronic apparatus for synchronizing seismic sources in marine geophysical exploration and electronic equipment; namely, a multi-programmer, specially designed interface tape transports, a geomechanic interface, screens, plugging wires, guns, and sensors designed to be fixed on the guns to capture signals used in conjunction with a computer in the field of marine geophysical exploration for acquiring radiopositioning data, recording raw navigational data together with non-seismic data and processing received data

providing navigational and positioning information via short-wave radios