This data set was acquired with a towed Sidescan Sonar on SeaMARC II during Thomas Washington expedition RAPA01WT conducted in 1990 (Chief Scientist: Dr. Ken Macdonald). These data files are of NetCDF Grid format and include gridded Sidescan data and were processed after data collection. Funding was provided by NSF grant(s): N00014-90-J-1645. This data was cited by Macdonald et al., 1992.