U.S. GEOLOGICAL SURVEY Coastal and Marine Geology Program Woods Hole, MA 02543   William Danforth, USGS, Chief Scientist Lt. Cheryl Callahan, NOAA, Chief Scientist PURPOSE OF CRUISE: To collect sidescan sonar and bathymetric data within the area designated as Gray's Reef National Marine Sanctuary located approximately 25 miles southeast of Savannah, GA. NAVIGATION TECHNIQUES: Real-time differential GPS SCIENTIFIC EQUIPMENT: Klein Model 531 100 kHz sonar towfish, Odem digital fathometer, QMIPS Data Acquisition station (PC-based collection system) ,DECstation 3100 UNIX Workstation (sonar processing platform) ,Raytheon TDU-850 Thermal Printer (for mapped sonar output),Benthos 7000 Acoustic Ranging Unit,Ashtech Differential GPS Receiver, Navigation Computer SUBMITTED BY AND DATE: William Danforth - September 8, 1994 Sidescan Image Bathymetry Image For more information on this cruise and the data collected check out the United Staes Geological Survey Page at http://kai.er.usgs.gov/surveys/area2/ga/grnms.html