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+--- Thread: Dragonfly 7" fish about 20 inches long from sonar image? (/showthread.php?tid=2592)
Dragonfly 7" fish about 20 inches long from sonar image? - ray18 - 02-26-17 11:58 AM
Dragonfly 7" fish about 20 inches long from sonar image?
I captured this fish lying on the lake bottom of 8 feet deep with my dragonfly 7 chirp fishfinder. I zoomed into water column between 4 feet and 8 feet. The fish is taking about 25% of the screen. I know my sonar covers 5 feet diameter circle cone for every 3 feet of water.
Am I correct about my calculation of the fish size?
25%*(8-4)*5/3=1.67 feet or 20 inches?
RE: Dragonfly 7" fish about 20 inches long from sonar image? - Chuck - Raymarine - Moderator - 03-01-17 05:02 PM
Welcome to the Raymarine Forum Ray18,
Please click here to view the response to your prior thread regarding interpretation of sonar images.