This data set was acquired with a ship-based Navigation system during Laurence M. Gould expedition LMG0412 conducted in 2004 (Chief Scientist: Dr. Wayne Trivelpiece). 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): Foraging Behavior and Demography of Pygoscelis Penguins and Copacabana Field Camp Opening, and funding was provided by NSF grant(s): ANT03-44275.