There are a number of computer programs and hardware that promises to make marine vessels more productive and interactive. For example, Maxsea, Marstons Mill, Mass. has a module that connects their chart plotter to the sensors of a dredge to record the vessel's track. The track can be displayed on the chart plotter and the data collected can be directly exported in the ASC II format for use by other data processing software. The seabed outline is displayed "live" in 2-D and 3-D and the data is recorded. Need a tough bulkhead-mounted PC? Comark of Medfield, Mass. has a unit with the enclosure made of marine aluminum with an epoxy powder finish and is rated for a Nema 12 environment.