B175M Showing blobs not Arches

Discussion in 'Boat Electronics' started by |HEX|, Apr 6, 2018.

  1. |HEX|

    |HEX| Member

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    Hector F
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    So I just got my transducer installed, I messed with the settings but I never get to get fish arches like I want. All I ever get is blobs and I thought these transducers were supposed to separate targets even as small as bait fish. I took it out to the islands for cod yesterday and nothing. I installed the update this morning and took it out in the harvor and still showing blobs. Is it that this certain Chirp Transducer only shows blobs and not arches? Im pretty disappointed with my purchase and need some help.

    20180406_113458.jpg 20180406_114813.jpg 20180403_152536.jpg 20180403_153026.jpg
     
  2. Hismosa

    Hismosa I've posted enough I should edit this section

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    Only going to see arches/boomerangs on larger fish. Not piled up baitfish
     
  3. Fishingguy

    Fishingguy I've posted enough I should edit this section

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    Interesting...commenting so I can follow the thread.
     
    Last edited: Apr 6, 2018
  4. MYNomad

    MYNomad Heading South

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    Arches are produced when the leading edge of the signal, which is emitted in a cone shape from the transducer, first contacts a target. As that target gets closer to the center of the cone, the signal continues to be returned, but its distance from the cone decreases. Once the center of the cone has passed over the fish, the echo continues, but its distance again increases. Thus, the return begins as a fish at a greater distance (presented on screen as being a greater depth), then continuing as a single fish at a closer distance (shallower depth), and back to greater distance, thereby producing the distinctive arch. The wider the transducer's cone angle, the more pronounced the arch will be. And even with a very wide cone, if the target fish is off to the side of the boat, it won't present much of an arch, as the signal will never go through the center of the cone. Those fish may show up as a single, short duration target. As you get experience with your particular fishfinder, you will learn to distinguish bait balls from individual fish that go right under the boat, from fish off to the side.
     
  5. yakdout

    yakdout Professional

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    Yes
     
    Last edited: Apr 7, 2018
  6. BluefinCurly

    BluefinCurly Skipper

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    nothing wrong with those screen shots. Looks like haystacks of baitfish (the blob) , or as noted in 9ft of water small gamefish (the smaller returns)

    If you were getting NO returns, or excessive noise underway, then I might question the transducer or installation.

    Rick explained what makes an arch quite well.

    Other factors are scan rate and speed over ground, and as noted above freq and range.
    Read up on the relationship ship of frequency, beam width, and depth, and you will understand better.
     
  7. tuner

    tuner pysgotwyr

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    Do you have any screen shots at 100-200' ?
     
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  8. |HEX|

    |HEX| Member

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    Hector F
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    I didn't take any screen shots yesterday. I was in 200 and up to 350 feet of water, it has no trouble reading structure it's actually excellent and very detailed, just not getting the arches I thought I would get. I was doing some research and they mention that running the B175M at 85khz is good for shallow water, it's a similar beam compared to the B75H beam set at 130khz. I'm going to try that in the harbor tomorrow and spend more time playing with the settings and see if that doesn't do it. I'll try to get out deeper next week and mess more with the Medium Chirp as well.
     
    Last edited: Apr 6, 2018
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  9. Derby

    Derby My "Member" is Well Known.

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    Screen shots look good to me. Show us some shots when you know there are fish under the boat.

    Arches are nice, bacon too. Fish will show many different ways on a screen. Best is to keep experimenting. Save screen shots when you know your over yellows, tuna and rock fish. Then you'll start to get an idea of how the different fish will appear.

    What the fish are doing also affect return.

    Keep at it. Trust me, you will end up loving the CHIRP over traditional tone pulse sonar. You will also find times when a fixed frequency works a little better. It all comes with time using the equipment.
     
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  10. |HEX|

    |HEX| Member

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    I agree, I just need to spend some time figuring it out. That's a good idea about saving screen shots when I know there's fish, gonna start doing that for sure. Thanks for the tip.
     
  11. Larry3215

    Larry3215 Newbie

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    You may need to increase your scroll rate too.
     
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  12. kindafishy

    kindafishy I've posted enough I should edit this section

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    pacific edge sells a cd that is very informative on sonar use, tips, settings, etc. worth every penny.
     
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  13. Derby

    Derby My "Member" is Well Known.

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    Aside from experience, I learned most from the Marine Electronics Forum on The Hull Truth.

    Between Abbor and Semperfifishing, there is a mountain of information. Including when latest software updates come up and when and what bugs they solve, what transducer is beter for any given application..yadayada yada.
     
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  14. irob2

    irob2 I've posted enough I should edit this section

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    these were big

    FOT8A2B.jpg
     
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  15. irob2

    irob2 I've posted enough I should edit this section

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    like this big

    20160827_103035.jpg
     
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  16. madrugador

    madrugador I've posted enough I should edit this section

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    This is that

    20170703_151711.jpg 20170703_190204.jpg
     
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  17. Derby

    Derby My "Member" is Well Known.

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    Or, this is that.

    Dux Salmon.jpg 20170708_195435_015.jpg
     
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  18. irob2

    irob2 I've posted enough I should edit this section

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    and these

    20160628_072156.jpg
     
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  19. edgarop

    edgarop Someday

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    Iron2 which garmin unit are you using. We just bought a 1042 xsv and are trying to figure out which xducer to buy. We are in norcal but plan on fishing in socal in the next few years.
     
  20. Derby

    Derby My "Member" is Well Known.

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    B175HW.

    Best all around "Fish Finder" out there for down to 300'.
     

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