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www.sea-technology.com October 2015 / st 23 Continental Shelf with a precision of 0.1° C. To date, about 30 Mastodon systems have been deployed in south- ern Brittany. The maximum depth of deployment has not been precisely de- termined, and we have not tested the mooring beyond a maximum depth of 130 m. The next development will be to extend the system to measure tempera- ture in the water column. To do so, the mooring system will be used as a vec- tor, securing a vertical line on the frame with a subsurface foat at about 10 m below the surface. Several temperature sensors will be distributed on this line. This inexpensive temperature sensor string can then measure the variability of the isotherm along a vertical gradi- ent under internal waves. A pressure sensor will be added to the electronic card to assess the depth of the temper- ature sensors, whose orientation can change with the tilting of the line due to currents, and a new housing mate- rial will be necessary to decrease the time constant, because internal waves can show high-frequency variability. Acknowledgments The authors would like to thank the staff at Ifremer who contributed to the development of the Mastodon mooring system: Lou Tisne spent six months as a student at Ifremer at the beginning of the project and contributed mainly to the laboratory tests; Nadine Lanteri provided access to the EMSO-Molène facilities; Peter Davies assisted in the pull testing; Laurent Delauney, Flor- ence Salvetat and Caroline Le Bihan participated in sensor calibration and in managing the Metrological Labora- tory operations; and Patrice Woerther, Coralie Trautman, Loic Dussud and Erwann Le Gall helped with the me- chanical design. The authors would also like to thank the Côtes de la Manche crew for or- ganizing and participating in the Mast- odon studies. This study was funded by the EC- 2CO program and Ifremer. ST Pascal Lazure is the head of the Mastodon project for Ifremer. He is a physical oceanographer involved in feld experiments and numerical modeling. David Le Berre is a technician at the Dyneco/ Physed Laboratory. He tested several designs of the Mastodon mooring system. Laurent Gautier is an electronic engineer from Ifre- mer's Research and Development Unit. Collect sound velocity profles on the fly! With the NEW Teledyne Oceanscience RapidCAST automated underwater profling system, gone are the days of stopping your vessel to collect sound velocity profles. RapidCAST's unique automated payout system allows for casts up to 500 meters depth while underway at up to 8 kts. The lightweight, portable design allows for installation onboard any size survey vessel, including a vessel of opportunity. RapidCAST—Increase your efciency, decrease your costs with every cast. The revolutionary RapidCAST www.oceanscience.com +1-760-754-2400 R i d C A S T I