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Down Scan Imaging & Deep Water

Old 10-20-2011, 01:20 PM
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Default Down Scan Imaging & Deep Water

Just curious if anyone has used these devices fishing offshore? Trying to do some research and they seem too good to be true. If they work as well as promoted, they would be great on diving trips and bottom fishing. Anyone?
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Old 10-20-2011, 02:00 PM
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From what I have herd (no experience myself), no worky in anything over 80 or 100' or something like that. i'm sure somebody will post some better info for ya.
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Old 10-20-2011, 02:25 PM
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I have the Humminbird 788ci di hd that I use exclusively offshore and the DI works well to about 200ft. The 2D works to about 600ft. Well worth buying.
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Old 10-20-2011, 04:06 PM
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Thanks Two, would you happen to have a screen shot pic?
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Old 10-21-2011, 08:03 AM
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How about swells having an affect on the picture of DI? Thanks for any feedback.
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Old 10-21-2011, 09:47 AM
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the swells affected the picture on my hds for sure. but when its calm it does what it claims. im looking into buying another for my current boat.
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Old 10-21-2011, 11:02 AM
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Lowrance/Simrad DownScan works typically down to 300' in saltwater.

Depth in the clip linked below and the picture is in meter, so the maximum depth shown is about 300'.

http://www.youtube.com/watch?v=hopTeDaauhw

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Old 10-21-2011, 11:51 AM
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Default Down Scan

deanboy21
I've had the Lowrance HDS-10 with LSS1 for over a year and i love the setup.
That said there are limitation to the side scan portion on the LSS1. Up to 50' the side scan does work well with good images it's best in shallow water. Wave action will effect the side scan.
The down scan gives you great definition of the bottom compared to the normal sonar. I used in 110' with good results. All fishing is in salt water.
Hope these images help
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Old 10-21-2011, 03:34 PM
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I've picked up wrecks to ~90'. The rougher it is, the worse it is. See Rocks in the 100-120' all the time. Around here, it goes really deep quick, so I don't have a lot of in between.

Way offshore, I pick up bait balls 200'+ to the sides, that is nice when slow trolling.

That said, it is not sonar.
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Old 10-21-2011, 04:15 PM
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Originally Posted by sandiegosteve View Post

That said, it is not sonar.
See what Dr Depth has managed with SideScan



http://www.drdepth.se/rdthree.php?l=gb
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Old 10-21-2011, 04:45 PM
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Default Dr Depth

It's a nice program (Dr Depth)
Same wreck top is a Down Scan view, botton is the Dr Depth 3D view
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Old 10-22-2011, 12:42 AM
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Originally Posted by CME View Post
Its not JUST the depth but the ocean CONDITIONS.
4" chop, no go after about 150'
SideScan, DownScan or both?
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Old 10-25-2011, 08:53 PM
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100'-150' would be fine for what i have in mind. My concern is diving and at times its tough to figure out what the stucture is. The Dr Depth looks interesting but is it for Side Scan only? Has anyone used Down or Side for diving?
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Old 10-26-2011, 05:56 AM
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Default Dr Depth

Dr depth has several version. Go to Yahoo groups for more info.
Yahoo Groups http://tech.groups.yahoo.com/group/DrDepth/
Dr Depth http://www.drdepth.se/index.php?l=gb
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Old 10-26-2011, 01:52 PM
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I've posted this before I think.

A wreck (intentional reef) in ~80 I went directly over.

Rocks in about 70 with kelp around (and fish). Rocks show as nice shadows.
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Old 10-30-2011, 05:08 AM
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heres some from 120 ft
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Old 11-02-2011, 04:45 PM
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I went over the HMS Yukon, a known wreck that is pretty big in ~95' of water on its side. It showed up.



While checking out side scan in deeper water ~300', you don't see the bottom. It is "side scan" so it is looking way out. Down scan was similar to regular 200/50khz.

I don't know what I think the working depth is, but on 100', you get a decent view of what is to the side.


I also found that since the "side" is to the side, there is a mild blind spot when your are right over things. Makes sense. The second shot took me going out to the side a bit on a smaller known wreck.
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Old 11-02-2011, 06:45 PM
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Wonky maybe, but you can still find the structure. So the picture quality is degraded, so what??? IF you are using the unit to post fancy pictures on the internet, then yes sea conditions need to be FAC. If you are out fishing and want to find the structure it doesn't matter - you will still be able to use it. If you are in 4 foot seas, your 2-d sonar will have a similar wavy return - doesn't necessarily mean you won't be able to fish.
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Old 01-21-2012, 08:46 PM
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Default Lowrance Elite-5

I'm going to give the Elite-5 DSI Gold and see how it works. There is a $100-$200 mail-in rebate going on right now through Lowrance depending on the model you get.
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Old 01-22-2012, 04:02 AM
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CME Its side to side rocking that degrades the picture. Not so much in head sea, under way the system works unreal. I have installed one on a 31 bertram the owner could not be happier his first sea trial of the system was in a heavy short chop We went right to his best reef waypoint and guess what it was an old wooden ship wreck very low to the seafloor it had never shown on his Furuno!
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