This data set was acquired with a ship-based Navigation system during Thomas Washington expedition MRTN06WT conducted in 1984 (Chief Scientist: Dr. Peter Lonsdale). These data files are of Text File (ASCII) format and include Navigation data and were processed after data collection. Data were acquired as part of the project(s): Studies in the Tonga Trench, Louisville Ridge, and Eltanin Fracture Zone, and funding was provided by NSF grant(s): N00014-80-C-044003.