This data set was acquired with a ship-based SeaBeam 2112 Navigation system during Laurence M. Gould expedition LMG0504 conducted in 2005 (Chief Scientist: Dr. John Hildebrand). 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): Mysticete Whale Acoustic Census in the GLOBEC West Antarctic Project Area, and funding was provided by NSF grant(s): ANT99-10007.