This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP9909 conducted in 1999 (Chief Scientist: Dr. John Bengtson). 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): Antarctic Pack Ice Seals, and funding was provided by NSF grant(s): OPP98-15961.