Cruise Report
                                
                    R/V Farnella, 1985 Leg 4
                4 November 1985   3 December 1985
                        Kathryn M. Scanlon
                     U.S. Geological Survey
                      Woods Hole, MA 02543
                                
                                                         
                          Cruise Report


Ship:                 R/V FARNELLA         Roy Hadgraft, Captain

Cruise number         FRNL 85-4

Area of operations:   Exclusive Economic Zone (EEZ) of Puerto
Rico and the U.S.Virgin Islands

Cruise dates and ports:                
Begin - 4 Nov 85          (San Juan, Puerto Rico)
End   - 3 Dec 85          (San Juan, Puerto Rico)

Scientific Party: This cruise was carried out jointly by the U.S.
Geological Survey (USGS) and the British Institute of
Oceanographic Sciences (IOS). Personnel from the Geological
Survey of the Dominican Republic (DR), Puerto Rico's Department of
Natural Resources (DNR), and Great Britain's Research Vessel
Services (RVS) also participated. Scanlon (USGS) and Masson
(IOS) shared the duties of Chief Scientist while Harris (IOS) was
designated as Party Chief.

Kathy Scanlon       Geologist           USGS/Woods Hole
Doug Masson         Geologist           IOS/U.K.
Bob Halley          Watchstander        USGS/Denver
Juan Trias          Watchstander        DNR/Puerto Rico
Rafael Rodrigruez   Watchstander        USGS/San Juan
          4 Nov-15 Nov
Chris Polloni       Watchstander        USGS/Woods Hole
          15 Nov-3 Dec
Elsa Hernandez      Watchstander        Dominican Republic
Malcolm Harris      GLORIA Engineer     IOS/U.K.
Jon Campbell        GLORIA Engineer     IOS/U.K.
Eric Darlington     GLORIA Engineer     IOS/U.K.
Dann Blackwood      Photographer        USGS/Woods Hole
Alan Gray           Airgun Engineer     IOS/U.K.
Gareth Knight       Navigation          RVS/U.K.

Purpose: The purpose of this cruise was to map the entire ocean
floor of the EEZ of Puerto Rico and the U.S. Virgin Islands.

Scientific Equipment Employed and Data Collected:
     - GLORIA II long-range sidescan-sonar system was used on its
30-second scan setting.  The data were recorded digitally on
magnetic tape and were also printed on photographic film.
     - The single-channel seismic-reflection profiling system
used an 80 cu. in. airgun. These analog data were recorded on
magnetic tape and on 2 flat-bed recorders at-5- and 10-second
sweeps.
     - 10 kHz echo sounder data were recorded on a wet paper
record.
     - 3.5 kHz echo sounder data were recorded on a paper record.
     - Magnetic data were recorded on both magnetic tape and
paper.
     - Navigation was provided mostly by transit satellites and
dead reckoning.  GPS was used during the few hours each day when
it was available. Data were recorded on magnetic tape.

Tabulated Information:

     - Days at sea: 30
     - Line miles of data (each type listed above): 5150 n. miles
(9538 km)

Comments:

     The GLORIA side-scan sonar data are of excellent quality and
complete coverage of the EEZ area was obtained.   No down-time
was experienced by GLORIA.  The airgun, 10 kHz echo-sounder, and-
magnetic data are also of high quality with only a few hours of
airgun data lost because of technical problems.    The 3.5 kHz
echo-sounder records vary in quality from good to very noisy.

     This cruise was made scientifically successful and most
enjoyable by the cooperation and competance of the ship's
officers and crew and our multi-national scientific staff.