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16 st / March 2015 www.sea-technology.com debris. The data were compared with an underwater magnetic survey conducted previously over a one-week period and re- vealed a close correlation of the most prominent targets, includ- ing numerous targets that were undetected during the water- borne survey. The survey confrmed that the detection of 155-millimeter projectiles is possible up to a dis- tance of 23 feet. It also resulted in the additional detection of smaller targets that were beyond the scope of this test. Conclusion The survey confrmed that the detection of 155-millimeter projectiles is possible up to a distance of 23 feet and that smaller targets (not within the scope of this test) were also detected. n detection benefts of airborne potassium vapor magnetometers become very apparent. An air- borne survey, conducted along the Florida coast in December 2013, not only detected all se- lected waterborne targets, but also clearly identifed numer- ous additional targets within and outside of the waterborne boundary. Even with smaller targets and increasing water depth, the airborne system was still able to identify targets due to the high-sensitivity potassium sensors and advanced process- ing techniques. Case Study Two: Shallow- Water UXO Detection. This case study demonstrates the direct detection capabilities of ASI's magnetic gradiometer over a known UXO site located at Lac St. Pierre, Canada. For this study, conducted in August 2012, a 100 percent survey was conducted over a 30-acre area of shallow water (about 6 feet deep). The purpose of the study was to determine the detection capability of 155-millimeter projectiles from the air. Following the survey, a limited hard prove-out (HPO) was conducted to verify a few of the detected targets. In summary, the 30-acre area was covered in just over an hour and revealed a large number of targets, includ- ing several confrmed 155-millimeter projectiles and other Sean Scrivens is vice president and chief geophysicist with Aqua Survey Inc. Holding a degree in computa- tional geophysics, Scrivens has spent the last decade spearheading geophysical equipment and software development, with the goal of creating innovative solutions for the detection of unexploded ordnance throughout the world. "Even with smaller targets and increasing water depth, the airborne system was still able to identify targets due to the high-sensitivity potassium sensors and advanced processing techniques." Hydrography Civil engineering & dredge Defense & security Offshore All the sonars you need, in one place www.teledynemarine.com