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How often do you graph fish? I'm new, just got a helix 7 si. I think I've seen fish on si while trolling around but I don't think I ever have seen anything on di. You guys getting fish every outting? Maybe I need to increase my sensitivity I'm not sure. I installed it myself, so maybe I'm just way off on everything.
Best thing you can do is go fish with someone that's been doing it a while. Save yourself a lot of time.
I don't fish if I don't see them on the locator.
I fish small waters mostly. I see fish every time but the locations change as the fish move. Sensitivity is important. Redge is right. Draft off of someone else's experience until you get a comfortable routine
I AGREE,I DO NOT STOP TILL I SEE FISH AND THEY MUST BE BIG ENOUGH FOR ME TO STOP
It's important to understand that the HB core series SI units do not have a "down pointing" piezo to detect targets directly under the boat ...
http://i477.photobucket.com/albums/r...ps4069bebe.png
The HB SI unit uses the echoes received from the "side pointing" SI piezoes ... and computer generates that SI data into a "faux" DI image ...
Any target that is closer to directly under the boat will be in the outer fringe lesser strength of the SI sound pulses ... basically reflecting weaker echoes of targets directly under the boat ...
Rickie
Amen ... to that statement! Except for Saugeye, he will fish for them when he can't see um. :biggrinQuote:
Originally Posted by Redge
Anyone in truman lake area to help a guy out lol
I have a Helix 7 SI also, been using it for a couple months. Something that helped me early on was making recordings on a microSD card, then looking at them on the laptop later. My first recording was going through a breakwater into the harbor/boat launch area, intending to look under docks with SI. I was busy at the time paying attention to where the boat was going, watching one side of SI, etc. When I played back the recording, I was amazed at how many fish I drove over top of without seeing them real time. I also noticed some small features that had fish stacked on them, that later I went back and investigated closer.
I hope this isn't illegal, but a good lesson on electronics image interpretation. I believe they are even from birds'
Viewing a thread - A fire drill with Sonar, Down images.....(Pic Heavy)
Sorry Rickie ; I don't understand???Quote:
Originally Posted by rnvinc
Down imaging transducers have a beam that is aimed straight down. The cutaway above shows how the beam producing elements in an SI transducer are aimed out to the sides (for reasons which should be obvious). The down imaging screen on an SI unit is a computer generated image of a blend of the left and right sonar returns that are directly under the boat. Since the strongest returns come from the center of the imaging beam, the down imaging returns on an SI unit often leave something to be desired versus the down imaging returns from a DI unit. I still find that I prefer to include the DI returns in the triple view rather than just 2d and SI, you still get a much better idea of the size of fish and the shape of brush and such. I have been thinking about trying contour mode for my SI when not viewing SI only since I don't really need a big chunk of my display showing me the water column when I am already seeing it in 2d and DI.
It is extremely helpful to have two fish finders on a boat.Even if the second one is a cheap one. It is invaluable to see how two different sonars interpret a target. You can buy a cheap dedicated di unit. When you really want to just set up on top of something and get an accurate picture and compare the two units it can really help .
:ThumbsUpQuote:
Originally Posted by OrangeAgent
Rickie
I get it now. I have a 859DI up front ; 18 feet from 999SI transducer but still comparable. I have noticed a difference in the past... I will check it out further. Thank you gentlemen.