This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP9904 conducted in 1999 (Chief Scientist: Dr. Gary Klinkhammer). 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): Heat and Chemical Exchange During the Early Stages of Back-Arc Rifting in a Polar Region: Hydrothermal Activity in Bransfield Strait, Antarctica and Multibeam Sea Test, and funding was provided by NSF grant(s): OPP97-25972.