Dive Teams Depend on Detection Devices JW Fishers Metal Detectors

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Dive Teams Depend

on Detection Devices

Clockwise from top left; Louisville Fire Dept dive team members with their Fisher side scan, Washtenaw County Sheriff’s diver with Pulse 8X, Rochester Police dive team member with their SCAN-650 sonar, Chief David Pease of REDS Team with Pulse 6X and recovered handgun.
     Public safety dive teams depend on sonars, ROVs, and underwater metal detectors to accomplish their underwater search operations safely and effectively. When a New York man accidentally fell from a concrete ledge into the Genesee River, the Rochester Police dive team was immediately dispatched. To save time, the incident commander made the decision to deploy a SCAN-650 scanning sonar recently acquired from JW Fishers Mfg. The sonar transmits a sound wave that sweeps a circle up to 200 feet in diameter. The wave bounces off any object on the bottom and the return signal is sent topside where it produces an image on a laptop computer showing the operator exactly what’s down there, regardless of water clarity. Officer Paul Romano reported, “We set up the SCAN-650 and found a target relatively quickly. A diver was splashed and confirmed it was the victim. The sonar was instrumental in helping make a fast recovery.”
Another sonar being used by many teams including the Alaska State Troopers, Louisville Fire Department in Kentucky, and Bingham County Search and Rescue in Idaho is side scan. Instead of deploying the device from a stationary position like the SCAN-650, the side scan sonar is towed behind the boat and scans hundreds of feet of ocean, lake or river bottom with each pass of the vessel allowing a large area to be searched in a very short time. Encompassed within Bingham County is 26 square miles of water including the Snake River and the American Falls Reservoir. This summer proved to be an especially treacherous one on Idaho’s waterways with 7 people drowning since Memorial Day. To assist in their recovery operations the county’s search and rescue group, in conjunction with the Bingham County Sheriff Department, recently acquired a JW Fishers SSS-600K side scan. This sonar will locate anything from a drowning victim to a sunken vessel. The image displayed on the topside computer looks as if the water has been removed and the operator is seeing everything on the bottom. In Alaska there are thousands of square miles of ocean surrounding the state, and many lakes and rivers scattered across its interior. Much of this water is frozen for a good part of the year. Alaska State Troopers must have the ability to respond to a variety of emergencies whether its a vehicle going off the road into water, or a ski mobile disappearing though the ice. The agency acquired both a SCAN-650 scanning sonar and the SSS-600K side scan for their varied call outs. The scanning sonar is easily deployed through a hole in the ice and scans a large diameter circle on the bottom, a task that would be dangerous and time consuming for divers. The towed side scan is employed when large areas of open water need to be searched. When a target appears on the computer screen, the operator simply clicks the mouse on the object and the GPS position is displayed, making it easy to relocate and recover the target.
In Missouri the Highway Patrol handles more water-related incidents than any other agency. Each year their dive team conducts an average of 55 underwater operations to recover the victims of drownings and boating accidents, or to retrieve evidence for criminal felony cases. Team members utilize underwater metal detectors, remote operated vehicles, sonars, and underwater video systems to help locate and photograph evidence. Included in their equipment locker is a JW Fishers SeaOtter-2 ROV, a TOV-1 towed video system and a Pulse 8X metal detector which is an essential tool for locating evidence disposed of in a waterway. Many criminals mistakenly believe if they dispose of gun or knife in a waterway, it will be lost forever. But police divers routinely prove them wrong by finding weapons, shell casings, stolen objects, and explosive devices with the Pulse 8X.
Two other groups that have discovered the effectiveness of underwater metal detectors are North Carolina’s REDS Team, a non profit group consisting of Rescue, Extrication, and Delivery Specialists, and the Washtenaw County Sheriff’s Office Dive Team. David Pease, chief of the REDS Team, said their JW Fishers Pulse 6X detector helped locate a gun for their local police department. Washtenaw dive team member Sgt. Paul Cook reports, “we have used the Pulse 8X with excellent success locating many items for evidence including spent cartridge casings, weapons, and property. It’s a valuable piece of our kit and we’d be lost without it.”
A few of the many other agencies using JW Fishers search equipment are South Carolina’s State Law Enforcement Division (SLED), Suffolk County Sheriffs Marine Unit in New York, Royal Canadian Mounted Police Underwater Recovery Team, Miramar Police Dept in Florida, Gallatin County Rescue in Montana, the US Air Force Rescue Squad, US Border Patrol, Los Angeles Port Police, Monmouth County Sheriffs Office in New Jersey, Wichita Falls Police Dept and Laredo Fire Dept in Texas, and Boston Police Special Operations Unit.

JW Fishers SeaOtter-2 ROV

  JW Fishers SeaOtter-2 and SeaLion-2 are state of the art ROV systems with sophisticated four motor propulsion, front and rear facing video cameras with both pan and tilt capability, front and rear lights, and a topside control console with flat screen display built into a rugged waterproof case. These ROVs are the ideal tool for pipeline inspections, river and ocean searches, dam inspections, oil and gas platform work, aquaculture observation, inspections in hazardous environments, use by law enforcement and public safety dive teams, and military ops. The more-powerful SeaLion-2 has a 1,000 foot depth rated housing and 15.4 inch flat screen  display.  The more economical SeaOtter-2 has a 500 foot depth rated housing and 10.4 inch display.
Options for these ROVs include scanning sonar, a metal detector, manipulator arm, longer umbilicals, two side cameras, text overlay, computer control, and built-in DVR digital video recorder.
To receive a detailed technical data sheet with all specifications go to www.jwfishers.com or send an email request to info@jwfishers.com.

JW Fishers Side Scan Sonars

   JW Fishers sonars offer a number of advantages over other low cost side scan systems. Some of these are; a larger towfish for greatly increased stability of the transducers, sophisticated software, the ability to have two sets of transducers in one towfish, and the capability to operate with cable lengths up to 1,000 feet. feet.
The quality of the images produced by any side scan system is directly related to the stability of the platform that moves the transducers through the water. Many low cost side scans have a small towfish. The drawback of a small fish is that it can easily be tossed about by underwater currents or affected by movement of the boat due to wave action which can be transmitted down the cable. This leads to poor quality images from the unstable movement of the fish. Fishers four foot long towfish provides an extremely stable platform for the transducers. The fish moves through the water like an arrow through air, which produces high resolution images.
The quality of the software, which is the “brains” of a sonar system, is another feature that differentiates Fishers side scan from other low cost systems. Fishers SONAR VIEW software has a vast array of features that gives the operator tremendous versatility in displaying and manipulating the sonar data coming up from the towfish. In addition, optional mapping software allows the operator to see the track of the boat as it travels over the search area and the size of the area being scanned, ensuring no part of the search area is missed. During playback the track can be overlaid onto a nautical chart showing the exact location of the search operation.
Many low cost side scan systems are available in only one frequency, or have different towfish for different frequencies. To change frequencies requires “reeling in” one towfish and then deploying another, an arduous and time consuming operation.
JW Fishers offers three frequencies; 100K, 600K, and 1200K. Side scans are available in either single or dual frequency, with the customer selecting which frequency or frequencies they require. In Fishers dual frequency side scan there are two sets of transducers in one towfish. This allows the operator to quickly and easily switch between frequencies at any time during operation. Lower frequencies have longer range, but lower resolution, Higher frequencies have a shorter range, but higher resolution. 
   The typical ratio of cable length to tow depth is 4 to 1. This means to tow the side scan fish at a depth of 100 feet requires 400 feet of cable. Some low cost systems have a limited length of cable they can operate with. Fishers sonars can work with cable lengths up to 1,000 feet. This means they can be towed at a depth of 250 feet. When coupled with the optional DDW-1 deep dive wing, Fishers side scans can be towed at depths up to 500 feet, which is beyond the depth capability of many of the small systems.
   To receive a detailed technical data sheet with all specifications go to www.jwfishers.com or send an email request to info@jwfishers.com.         

JW Fishers Pulse 8X metal detector

  The Pulse 8X comes with everything needed for land and underwater metal detecting. JW Fishers detectors are commercial-grade machines that work equally well on land and underwater. This detector will locate a variety of targets including jewelry, coins, shell casings, weapons, gold bars, anchors, ordnance, cannons, and pipelines. The Pulse 8X uses state-of-the-art Pulse Induction technology to detect all metals, ferrous and nonferrous, while ignoring mineral in the environment such as salt water, coral, black sand, and high-iron rocks. Fishers detecors are not affected the material betweeen the metal object and the search coil. The detection range remains the same whether detecting through air, water, silt, sand, mud, or rock.
The Pulse 8X has both visual and audio readouts. Audio is provided by an underwater earphone that tucks under the mask strap or into a diver’s hood. The visual output is displayed on a large, easy to read meter. The 8X comes with a complete accessory package that has everything needed to use it on land, in the surf, or diving to depths of 200 feet. Included in the kit.  Included in the kit are land and underwater earphones, a high-impact PVC handle for underwater use, an anodized aluminum handle for land use, AC battery charger, DC battery charger, hip-mount kit, and a heavy duty cordura nylon carry bag. Rechargeable batteries power the detector for 12 full hours. Batteries can be easily field replaced to provide around the clock operation.
One of the most unique features of Fishers detectors is the complete line of interchangeable coils available. The range includes a probe coil, 5 inch coil, 10 inch coil, 16 inch coil, 18 inch coil with 100 foot cable for boat deployment, and an 8 x 48 coil coil that is mounted on 4 small skis for dragging on the beach or in shallow water.
For more information on the Pulse 8X go to www.jwfishers.com and click on the Products tab at the top of the page, then click on hand-held metal detectors and Pulse 8X.

To request a catalog on JW Fishers complete line of underwater search equipment go to www.jwfishers.com or send email to info@jwfishers.com.
JW Fishers Mfg. Inc.
1953 County Street
East Taunton, MA 02718 USA
PH: (800) 822-4744, (508) 822-7330
FAX: (508) 880-8949
EMAIL: info@jwfishers.com
WEB: www.jwfishers.com
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