Is this an amazing 4 feet long watersnake sonar image?

ib18

Chief Petty Officer
Joined
Mar 2, 2013
Messages
489
Is this an amazing 4 feet long watersnake sonar image?

I was fishing and heard a beep from my Raymarine dragonfly 7 fish id alarm, so I looked down and here is this floating straight line on the sonar screen. I quickly took a screen shot of the sonar. According to my calculation, this watersnake is 4 feet long. Wow, amazing.

Raymarine Dragonfly 7 detects a circle cone with 5 feet of circle at 3 feet water depth, so anything takes over my entire screen at 10 feet deep is going to be 10/3 times 5=16.7 feet diameter circle. But this watersnake takes over 50% screen so it is about 8 feet long. But, I zoomed into water column 5.1 feet to 9.8 feet deep. So, in essence I shrinked the cone by 50%. Instead of being 10 feet deep of water without zoom, I was looking at only 5 feet deep of water. So, the 8 feet long watersnake is now 4 feet long.

Wow, still amazing! It floats in the water in a straight line as if the watersnake is sleeping?
 

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wrvond

Chief Petty Officer
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Mar 2, 2010
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597
I wouldn't rule it out. Though it could also be a tree branch or underwater cable.
 

ib18

Chief Petty Officer
Joined
Mar 2, 2013
Messages
489
Time to buy a side finder or structure scan
 
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