This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP9503 conducted in 1995 (Chief Scientist: Dr. Martin Jeffries). These data files are of SHP format and include Primary Navigation data and were processed after data collection. Data were acquired as part of the project(s): The Role of Snow in the Antarctic Sea-Ice Development and Ocean-Atmosphere Energy Exchange, and funding was provided by NSF grant(s): OPP93-16767.