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The sonar plan

The survey on Thursday will consist of descending a sonar device (Supplied by Kongsberg Maritime) into the water to about a meter from the bottom. Once at proper depth, the device will perform a 360 degree sweep of the bottom. It will be set to extend to 50m creating a scanned circular area having a diameter of 100m. We laid out five points on the river Friday and at each of these locations we will be cutting an opening in the ice. The sonar device will be lowered into all five holes and the images from each will be pieced together to generate a very good image of the entire area of interest. The area to be scanned will be the one which revealed magnetic debris this summer with the help of Karl Butler from the University of New Brunswick and his magnetometer scan.


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