This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP0803 conducted in 2008 (Chief Scientist: Dr. Philip Bart). These data files are of MGDS:Nav format and include Primary Navigation data that have not been processed. Data were acquired as part of the project(s): Ross-Sea outer continental shelf morphology and near-surface stratigraphy: Quaternary ice-sheet grounding-zone migrations and stratigraphy: Quaternary ice-sheet grounding-zone migrations and the LGM dilemma., and funding was provided by NSF grant(s): ANT05-38475.