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Raymarine forum / Raymarine Forums / Fishfinders v / Dragonfly 7" fish about 20 inches long from sonar image?

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Dragonfly 7" fish about 20 inches long from sonar image?
02-26-17, 11:58 AM
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ray18 Offline
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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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Dragonfly 7" fish about 20 inches long from sonar image? - ray18 - 02-26-17 11:58 AM

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