Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Douglas Reed, MegRich, BU343, BPurvisJr, Volco
104465 Registered Users
Top Posters
TexDawg 84506
hopalong 76607
Pilothawk 74371
JDavis7873® 67382
John175 ® 62511
FattyMcButterpants 60659
Tritonman 57370
Derek 57341
SkeeterRonnie 52796
LoneStarSon® 52662
facebook
Forum Stats
104465 Members
60 Forums
837218 Topics
11952084 Posts

Max Online: 36273 @ 01/23/13 02:34 PM
Topic Options
#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.
_________________________
To fish or not to fish is the question

Top
#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: 12789
Loc: highland village/lake Lewisvil...
Looks like bait
_________________________
I live with Fear everyday but sometimes she lets me go fishin
Lewisvillecatfish.com

PB 65#
www.lewisvillecatfish.com
Facebook.com/Tom Gravley
www.youtube.com/gravleybrats

Top
#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: 1235
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?
_________________________
Capt. Craig Copeland
Licensed by the US Coast Guard

2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)

Top
#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: 3591
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)
_________________________
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1

Top
#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: 3591
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.
_________________________
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1

Top



© 1998-2017 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide