This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP0401 conducted in 2004 (Chief Scientist: Dr. Terry Wilson). 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): Neotectonic Structure of Terror Rift, Western Ross Sea, and funding was provided by NSF grant(s): OPP01-25624 and ANT01-26279.