This data set was acquired with a ship-based Navigation system, Trimble 20636-00SM Navigation system, Ashtech ADU2 Navigation system, and Yokogawa Gyro Navigation system during Nathaniel B. Palmer expedition NBP0201 conducted in 2002 (Chief Scientist: Dr. John Anderson). These data files are of MGDS:Nav format and include Primary Navigation data and were processed after data collection. Data were acquired as part of the project(s): Late Pleistocene to Holocene Glacial History of West Antarctica, and funding was provided by NSF grant(s): OPP99-09734.