This data set was acquired with a ship-based Echosounder Sonar, Gravimeter, and Magnetometer during Eltanin expedition ELT54A conducted in 1972 (Chief Scientist: Dr. Rudi G. Markl). These data files are of MGD77 format and include Singlebeam Bathymetry, Magnetic Field, and Gravity Field data and were processed after data collection.