POLICE Magazine

MAY 2019

Magazine for police and law enforcement

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P O L I C E M AG .C O M 39 tilt capability, providing the topside op- erator a clear picture of the underwater environment. Weighing less than 45 pounds, the ROV is easily deployed and recovered by a single person. To fit the varied requirements of pub- lic safety agencies and military units, Fishers' ROVs are available with an ex- tensive set of options that allow them to be tailored to specific missions. Options for the system include a manipulator arm, side cameras, and sector scanning sonar (SCAN-650) technology. With a manipulator arm, the ROV can pick up a lightweight object off the bottom or carry an acoustic pinger and drop it on a submerged object. e scanning sonar mounted on the ROV allows the opera- tor to "see" far beyond the range of the camera. SONAR Scanning sonar can be used very effec- tively as a standalone search system. Law enforcement agencies are using scanning sonar in their underwater search operations to find drowning victims, bodies of murder victims or suicidal subjects, sunken vehicles, sunken vessels, and other evidence. One key advantage of scanning sonar is its ability to produce a "picture" of the underwater environment, even in zero visibility. Using this sonar dramatically reduces the exposure time of divers in sometimes frigid or dangerous waters. One of the reasons for choosing scan- ning sonar instead of a side scan system is its significantly lower cost, although it is not as effective for searching large areas. is can be a powerful argument for agencies working on a limited bud- get. Scanning sonar systems require a stationary deployment or mounting on another system; this is often an advan- tage over the larger towed sonar sys- tems. With towed side scan technology, the towfish must be moving to create an image, whereas the scanning sonar transducer can be held in a fixed posi- tion. When searching a lake bottom that is covered with trees or large rocks, it may be difficult if not impossible to tow a sonar system. Lowering the scanning sonar, however, is simple and efficient. Deploying the scanning sonar system on a pole or cable when standing on a solid structure can be a quick and easy way to deploy it. e sonar software has a host of fea- tures that allow the search to be tai- lored to the needs and preferences of the operator. e size of the search area can be selected and the operator can choose whether to scan the complete area or just a portion of it. A variety of color schemes in 256 shades are avail- able to display the sonar images. ere is a choice of step sizes, sweep speeds, and a sizing tool that shows the length and width of the target. High-resolution images are displayed on a topside lap- top computer or tablet mounted in the lid of the Sonar Processor Box. Scanned data files are stored on the computer's hard drive along with the boat's GPS position, the time and date, and other pertinent data. Recorded files can be played back at any time, and small file of Fishers' handheld metal detectors, either the Pulse 8X or the SAR-1 Search and Recovery detector. e Pulse 8X is JW Fishers' leading underwater metal detector and has been an industry leader for the past 32 years. In 2014, it was named the top underwater metal detector in an inde- pendent study performed by the U.S. Department of Homeland Security. e P8X was compared to seven other lead- ing detectors on the market and found to be the most economical, effective, and reliable tool for the job. e P8X comes with everything needed to search both on land and while submerged to a depth of 200 feet. e unit comes equipped with a land handle and telescopic extension, an underwater handle, two chargers (AC/ DC), a land headset, an underwater "bone" phone, and a diver's belt to hip- mount the unit. e SAR-1 underwater metal detec- tor was introduced in 2017. is detec- tor was purpose-built for law enforce- ment and other public safety dive teams whose mission sets include locating metallic objects in low visibility envi- ronments. e SAR-1 has a streamlined and snareless design with no external wires or cables. ese features make the SAR-1 an excellent tool for work in environments containing hazards. e SAR-1's 10 ultra-bright LEDs and sen- sory (vibration) target indicators make this unit one of a kind. A few of the many law enforcement teams using Fishers' detectors include: the U.S. Coast Guard, U.S. Border Patrol, Missouri State Water Patrol, the Plac- er County (CA) Sheriff's Department, the Lowndes County (GA) Sheriff's Department, the Jackson County (WI) Dive Unit, the Detroit Police Underwa- ter Recovery Unit, the Houston Police Dive Team, the New Jersey State Police, the New York State Police, the National Police Dive Squad in New Zealand, the Swedish Coast Guard, Japan's National Police Agency, and the Royal Canadian Mounted Police. For more information on Fishers' complete line of underwater search equipment go to www.jwfishers.com. Brian Smith Fisher is the chief operating officer of JW Fishers. Scanning sonar mounted on an ROV lets operators "see" under water far beyond the reach of a video camera or the eyes of an experienced law enforcement diver. sections and screen shots can even be copied for emailing. e included GPS allows a target's position coordinates to be instantly viewed and automatical- ly stored with the sonar data. Optional boat tracking software shows the path of the boat as it travels over the search area and the width of the scanned area, all overlaid on a nautical chart. A few of the many public safety units using Fishers' sonar systems are the Beadle County (SD) Office of Emergen- cy Management, the Fall River (MA) Police Department, the Suffolk County (NY) Sheriff's Marine Unit, Union (PA) Fire Company, and the North Carolina Department of Transportation. METAL DETECTION Let's say you are looking for a discarded firearm in a body of water. Once a tar- get area is narrowed and a dive team has been deployed, it's time to use one

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