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Dragonfly 7" fish about 20 inches long from sonar image?
02-26-17, 11:58 AM
Post: #1
Dragonfly 7" fish about 20 inches long from sonar image?
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?

http://www.youtube.com/njfishing1 - from Captain Steve
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03-01-17, 05:02 PM
Post: #2
RE: Dragonfly 7" fish about 20 inches long from sonar image?
Welcome to the Raymarine Forum Ray18,

Please click here to view the response to your prior thread regarding interpretation of sonar images.
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