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Max Online: 36273 @ 01/23/13 02:34 PM
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#11041122 - 08/14/15 12:34 AM Sonar shows brush but DI shows blurr
ShaneOh Offline
Green Horn

Registered: 07/09/14
Posts: 13
Loc: Tyler, TX
I have seen some pretty lucid down imaging pictures. I can find brush and fish with my sonar but DI seems to not help any. Brush does not appear any clearer and fish do not show up as white dots as they should. Here's some example pictures. Please help me out guys because I would like to utilize my down imaging. My unit is the 899 SI DI hummingbird unit.
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#11041166 - 08/14/15 06:16 AM Re: Sonar shows brush but DI shows blurr [Re: ShaneOh]
tgravley aka lewisvillecatfish Online   content
TFF Guru

Registered: 02/06/09
Posts: 12722
Loc: highland village/lake Lewisvil...
Looks like bait
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#11043741 - 08/15/15 01:14 PM Re: Sonar shows brush but DI shows blurr [Re: ShaneOh]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1045
Loc: Richland-Chambers
DI does a very poor job of showing a few fish. It will show larger bait schools and some larger groups of fish. DI and SI is much better for showing structure and bottom contour.

what setting are you using on your DI?
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#11043809 - 08/15/15 02:12 PM Re: Sonar shows brush but DI shows blurr [Re: ShaneOh]
Wayne P. Online   content
TFF Team Angler

Registered: 11/16/10
Posts: 3429
Loc: Charlottesville, Va
An Imaging pulse is very thin front to back so it is not on a subject very long.

A 2D pulse is a somewhat inverted cone shape and will detect anything within its coverage for a lot longer period of time. More time=more pixels lit up=more history recorded.

The spec coverage angle for 200 kHz is 20 degrees. That equals 1/3 the depth.
The spec coverage angle for 83 kHz is 60 degrees. That equals the depth.

The Imaging pulse is just a few inches from front to back.
If you want more pixels lit with Imaging, increase your Chart Speed and stuff will take up more screen space.

This is a large brush/log pile with the three technologies:






With Imaging, the size of the parts of a brush pile is what is recorded, not an exaggerated blob like 2D does.


Edited by Wayne P. (08/15/15 02:23 PM)
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Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1

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#11043819 - 08/15/15 02:26 PM Re: Sonar shows brush but DI shows blurr [Re: ShaneOh]
Wayne P. Online   content
TFF Team Angler

Registered: 11/16/10
Posts: 3429
Loc: Charlottesville, Va
One more thing, if you did not exchange the included Compact SI transducer for the HDSI, you can get sharper images if you do.
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Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1

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