This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP0804 conducted in 2008 (Chief Scientist: Dr. Joann Stock). 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): Collection of marine geophysical data on transits of the Nathaniel B. Palmer, and funding was provided by NSF grant(s): ANT03-38317.