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Advantages of down imaging sonar

Old 08-26-2013, 10:51 AM
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Default Advantages of down imaging sonar

What are the advantages of a fish finder with down imaging?
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Old 08-26-2013, 02:53 PM
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I use side imaging. Haven't really done much with down imaging. I would presume is gives you a more life like view of what is beneath you than traditional sonar.
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Old 08-26-2013, 03:13 PM
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I've used it occasionally over the past year on my HDS-8 basically to get a different image than the traditional screen and to further define what I'm seeing. It does show structure, specifically trees and boulders, in a more realistic image than the blobs of traditional imaging, not unlike a black and white TV image. I would never want to use it as my only fishfinder however, and my buddies that have them feel the same.
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Old 08-26-2013, 03:31 PM
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It is a $44 upgrade to the HD unit without it I am looking at and I can turn it off when I want to (or use split screen) so I guess it may be worth the extra cash.
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Old 08-26-2013, 03:59 PM
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Originally Posted by osudaddy View Post
It is a $44 upgrade to the HD unit without it I am looking at and I can turn it off when I want to (or use split screen) so I guess it may be worth the extra cash.
I would go with the HDI all day long over either the down imaging only or sonar only models.
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Old 08-27-2013, 04:17 AM
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Down imaging can help speed the learning curve of traditional sonar - is that bait, fish or trees? No question with downscan.... Once you learn your sonar you'll probably not use it that much, though it does have its time and place. It can be useful for locating fish suspended in trees and such.

The real value in my book is sidescan, to find fish that are "just over there" which you would have never seen. Though I realize that pushes you up into higher end units.

Downscan does paint pretty pictures though - here is one a friend took of an old bridge on Smith Mountain Lake, VA.

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I also agree on not wanting ONLY down-imaging. Regular sonar is faster and easier to read, especially on smaller screens and fish will "pop" out from structure due to the different colors from density of the returns. On downscan fish will be smaller marks if the same color, though more intense. Downscan is just a good tool to confirm what you think you are then seeing.
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Old 08-27-2013, 09:12 AM
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Here's a good idea of the DownScan difference.
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Old 08-27-2013, 03:21 PM
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Originally Posted by osudaddy View Post
It is a $44 upgrade to the HD unit without it I am looking at and I can turn it off when I want to (or use split screen) so I guess it may be worth the extra cash.
Which unit is only $44.00 more....? HDS is more like $ 500.00 for the downscan LSS-2.
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Old 08-27-2013, 03:38 PM
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Elite-7 HDI. The DownScan electronics are included in all models, the only difference is if it comes with a 2D only transducer or a HDI transducer which is combining the 2D with the DownScan transducer.

LSS-2 also gives SideScan.
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Old 08-27-2013, 03:41 PM
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Abbor....Thanks for the information..
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Old 08-28-2013, 04:20 AM
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As was stated, down imaging will help shorten the learning curve on really understanding what i is you're looking at on the 2D sonar. It provides a much higher level of detail, especially on hard targets. Here is a screenshot of some trees. It shows a good comparison between side imaging, down imaging and 2D sonar:
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Old 08-28-2013, 05:06 AM
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I just bought an HDS 9 Touch and am installing the HDI 83/200 455/800 transducer. I don't want sidescan (at this time). I felt this was a good way to go for me. I haven't had it in the water yet but am anxious to see what it does. I don't think many people have used this combination so I'll post some results if I ever get out there...
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Old 08-28-2013, 06:40 AM
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I've used HDS-7 Touch with 83/200/455/800kHz HDI transducer in a portable setup on a small lake.

The DownScan had a bit lower resolution than what I've used to when using a StructureScan transducer.

The main DownScan advantage in freshwater is to be able to distinguish between underwater plants and fish shoals.
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Old 08-28-2013, 03:32 PM
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Originally Posted by nfairbank View Post
Which unit is only $44.00 more....? HDS is more like $ 500.00 for the downscan LSS-2.
http://www.thedigitaloasis.com/Hummi...l#.UhuUIdKsiSp

vs.the one $44 less

http://www.ebay.com/itm/Humminbird-5...item51a43896f5

Last edited by osudaddy; 08-28-2013 at 03:54 PM.
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Old 08-28-2013, 05:42 PM
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digital oasis has good prices, BOE will match...
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Old 08-28-2013, 06:52 PM
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I pulled the trigger on the DI unit.

This is a supplement unit to my Garmin 498 chartplotter/fishfinder and will help me, as fishingct suggested, help me better understand what I am looking at on regular sonar and may help me better tweek my Garmin unit.

Thanks for all the feedback and suggestions!
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