This data set was acquired with a ship-based Navigation system during Maurice Ewing expedition EW9011 conducted in 1990 (Chief Scientist: Dr. Paul Jeffrey Fox). 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): Ridge Segmentation, Plate Boundary Architecture and Behavior of Non-Rigid Discontinuities Along the MAR in the South Atlantic, and funding was provided by NSF grant(s): OCE89-17762.