Occasionally the 3.5 kHz system was used when the 12 kHz system was not operational. Data were automatically logged and merged with the sidescan sonar and navigation data. The profiling system comprises an Ocean Data Equipment Corporation Bathy 2000 signal correlator, and a Raytheon PTR transceiver, both driving a 3.5 kHz subbottom profiler housed in a towfish. 0.5 and 1.0 sec. Real time 3.5 kHz return signals were displayed on a 16 bit format color monitor and on analog ink jet color paper records.
All data are digital, merged with navigation and archived on optical disc.
CAP 6000A chirp sonar subbottom profiling system was also used in an effort to map the thickness and extent of any surficial sedimentary layers associated with dredged material disposal. Operational and theoretical details of the chirp sonar are explained in Appendix 2 and references cited therein. The acoustical data were displayed real time on a super VGA graphics monitor and paper copies were produced on a color jet printer. All data were archived on Sony digital audio tapes. The monitor and paper copies displayed color acoustic profiles and a variety of system settings.