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Sonar shows brush but DI shows blurr
#11041122
08/14/15 05:34 AM
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Joined: Jul 2014
Posts: 13
ShaneOh
OP
Green Horn
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OP
Green Horn
Joined: Jul 2014
Posts: 13 |
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.
To fish or not to fish is the question
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Re: Sonar shows brush but DI shows blurr
[Re: ShaneOh]
#11043741
08/15/15 06:14 PM
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Joined: Aug 2009
Posts: 1,681
Capt Craig
Extreme Angler
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Extreme Angler
Joined: Aug 2009
Posts: 1,681 |
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?
Capt. Craig Copeland Licensed by the US Coast Guard
2019 Nautic Star 215 XTS Shallow Bay Boat Humminbird HELIX 12 CHIRP MEGA SI GPS G3N Nautic Star Boats Pro Staff (nauticstarboats.com) Redneck Fish'n Jigs Pro Staff (redneckfishn.com)
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Re: Sonar shows brush but DI shows blurr
[Re: ShaneOh]
#11043809
08/15/15 07:12 PM
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Joined: Nov 2010
Posts: 5,101
Wayne P.
TFF Celebrity
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TFF Celebrity
Joined: Nov 2010
Posts: 5,101 |
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.
Last edited by Wayne P.; 08/15/15 07:23 PM.
Helix 12 CHIRP MEGA SI+ GPS G3N and G4N, 1198c SI, SOLIX 10 SI G3, Helix 8 MEGA SI+ GPS G4N, SOLIX 12 SI and G3, MEGA 360, MEGA LIVE TL, RC-1
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Re: Sonar shows brush but DI shows blurr
[Re: ShaneOh]
#11043819
08/15/15 07:26 PM
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Joined: Nov 2010
Posts: 5,101
Wayne P.
TFF Celebrity
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TFF Celebrity
Joined: Nov 2010
Posts: 5,101 |
One more thing, if you did not exchange the included Compact SI transducer for the HDSI, you can get sharper images if you do.
Helix 12 CHIRP MEGA SI+ GPS G3N and G4N, 1198c SI, SOLIX 10 SI G3, Helix 8 MEGA SI+ GPS G4N, SOLIX 12 SI and G3, MEGA 360, MEGA LIVE TL, RC-1
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