Thursday, July 12, 2012

RV Bellows Geomorphology/Shallow Shelf Seafloor Mapping Cruise - July 2012

DAY 1 (July 12, 2012)

At 8:00 am, after a late night working to get various equipment set up we were close to being ready to depart. The sonar system is tested and ready. We were still working to prepare the Trackpoint III USBL tracking system for its first use with our towfish, and getting other tasks completed.

Around 10:30 am (1430 UTC) we got underway. The plan was to deploy the tracking transponder on the seafloor as soon as we got offshore to run the calibration procedure using IPS software. The interfacing between software packages proved “troublesome”.  We got the communication working and deployed the beacon, but stubborn problems with the GPS interface and software configurations remained.  After several hours working with the Trackpoint system, we decided to proceed with starting the survey and to work on the tracking issues underway. For the type of mapping we are doing, our positioning will be OK even without the full USBL support since we can use cable out to project layback position of the towfish. Also, the USBL is giving us corroborating layback control.

By 2057 UTC we had the sonar up and running and heading south on the P transect.

Teledyne_Benthos C3D interferometric sidescan sonar. Included inside is an IXSEA Octans for heading, heave, pitch, and roll,  and a FSI NXIC flow-through CTD for sound velocity at the transducers.

Some adjustments to secure cables.
Deploying the towfish.  Here we go!

Post Author:
Dr. Stan Locker

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