This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP9305 conducted in 1993 (Chief Scientist: Dr. Martin Jeffries). 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): Sea Ice Physics-Structural Characteristics, Development and Synthetic Aperture Radar Signature in the Pacific Sector of the Southern Ocean, and funding was provided by NSF grant(s): OPP91-17721.