SonarTRX screenshot of image collected by Humminbird sidescan sonar

Screen grab of image collected by jetyak’s Humminbird sidescan sonar and displayed in SonarTRX software. Image shows boulders more than 2 meters (6 feet) across on the bottom of Hamburg Cove in the Connecticut River estuary, Connecticut, and a school of bait fish in the water column. The range displayed (vertical axis) is about 20 meters [65 feet], and the scales are the same in both vertical and horizontal directions, but the image has not been corrected for the “slant-range” distortions inherent in sidescan-sonar data (variations in scale from one side of the image to the other; see “Radar Image Distortions”).