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Jim and David, I'm an offshore structure nut, this fish where in 30' of water at edge of a flat. to the right of the graph would be 10-12' as you can see from the pictures full trees. I used a drop shot rig and Jigs. bait never made it to the bottom 90% of the time all between 9-11.5"
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Comment by Jacob Hill on September 11, 2012 at 5:40pm
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I am very jealous Federico! You really have a honey hole.
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Comment by federico del toro on September 11, 2012 at 4:59pm
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LOL
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Comment by dick tabbert on September 11, 2012 at 4:12pm
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Federico I have a hard time seeing a tree or trees in the finder.
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when the fish are not attacking the bait, they show up like arches, when they are cutting and feeding. the show up like streaks. I like the split screen because the suspended fish show up better as arches on the 77kHz. Again this is all with "0" technical and mostly empirical knowledge. I like to run it as close as I can to real time in this case, because sometimes I can see the bait bouncing of the bottom on the FF. You might not believe this but sometimes I see a streak going for the bait. Have you ever picked up you anchor and you can see the streak heading towards the top? this, and when I'm fighting a fish I can see streaks all over the screen, is what kind of gave me a clue as to what was going on
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Comment by Leo Nguyen on September 11, 2012 at 2:11pm
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That's pretty interesting. Your arch is side way, as the fish moves.
Does the full screen, rather than this split screen displays vertical arch?
The fish finders I'm used to normally display a vertical arch..in monochrome. Curious though, what's the max refresh rate you experienced with this unit Federico?
The arch appears to have a 2 secs refresh rate, but a 5 sec retention rate as it displays the info. Kind of curious.
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Leo, you pretty much got a much better explanation that I could ever come up with, in my own terms I use both because the 200kHz gives you a much better detailed picture of what you are seeing, it shows the smaller fish (bait and BG) a lot better. the way I would read this graph is a big ball of bait with BG feeding, I think the yellow streaks that you see is fish cutting thru the bait. every time I see those streaks near or around me I get bit.
So there you have it, the technical and the practical way of reading a graph, thanks Leo as always you have just enlighten me on the more technical aspects of the electronics
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Jonathan, correct me if I'm wrong Federico, the right side is the 200kHz, which is the circular sonar firing directly below the transducer. Since it returns a lot more details due to sound wave concentration, the depth and circumference is limited. Perfect for properly gauging the depths, as you see the 0 to 40 labels for the depths. Not sure what the model echo 300c depth to circumference ratio. Most smaller fish finders have the ability to detect a downward detection diameter of 0.5-to-1 ratio. Which is for every 10 feet down, one can see a detection of 5 feet diameter.
The one on the left is the 77kHz, which is the outer circumference of the sonar scan, to give you a broader perspective of what lies outside of the center detecting zone. The signal is weaker, but allows you to scan deeper and broader. Higher end small designed models and transducers allow you to expand your view ratio toward 1-to-1. So, every foot deep, you'll see 1 foot diameter. What I'm seeing here is a 0.75-to-1 or 0.85-to-1 ratio.
Recap, right side, you're seeing what's directly below the transducer's mounting area. Plenty of details for the structures below, with three arches seen between 15 and 25 feet markers. Left side is the wider view. I see two arches? Yellow color bottom is silt/sand. Blue is the harder/dense materials.
Hope I made the right deduction there, since I haven't play with colored unit yet.
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Comment by JBplusThuy on September 11, 2012 at 9:09am
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For those of us with no depth finders, what is it showing you in the left and right panes?
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Nice. They all huddled up in the structure and ready to strike.
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David here is a pic of the graph on the kayak, the trees are at 12' but the fish are on a drop off at 30'
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