This data set was acquired with a ship-based Magnetometer, Gravimeter, and Echosounder during Robert D. Conrad expedition RC1802 conducted in 1975 (Chief Scientist: Dr. Walter Pitman). These data files are of MGD77 format and include Gravity Field, Magnetic Field, and Singlebeam Bathymetry data that were processed after data collection. Funding was provided by NSF grant(s): DES71-00214.