This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP9906 conducted in 1999 (Chief Scientist: Dr. Ray Smith). 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): Long-Term Ecological Research on the Antarctic Marine Ecosystem (LTER): An Ice-Dominated Environment Ice Cruise, and funding was provided by NSF grant(s): ANT90-11927, OPP95-05596, and OPP96-32763.