A subsystem for electronic positioning and navigation at sea

An electronic subsystem was developed for on-line, real-time digital and graphical conversion of coordinates derived from a range-range mode electronic precision positioning and navigation system. The application of this development is well suited to high density tight-grid marine surveys, especially where accuracy and relocation of a few feet are required as in undersea mining and mineral deposit delineation. A substantial reduction in man-hours expended for data processing is realized with this capability, particularly in time expended pre-plotting grids prior to field work and data reduction and processing after completing the field work.