Humminbird Side Imaging Forums
General => General Discussion => Topic started by: chrismalinowski on March 27, 2012, 03:33:48 PM
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Hi all. I've been looking through the forums for information on the HB units. I am extremely new to SI so please be gentle. I am looking to purchase a unit for exploring fresh water depths to 200' or so. Looking for wrecks or other submerged items to be explored later while diving. I am not looking for fish. Nor do I necessarily have the need to have "live" info. It'd probably be best to review the SI data later if possible.
If I am correct (and that's not likely) it looks like the 898/998/1198 units all produce the same data, it's just the screen size that is the big difference. Please let me know if that is incorrect.
Also, most of the info I've seen on here are people who are doing stuff in pretty shallow water (less than 50'). While that would be nice, I'll probably be doing some stuff up to 200' of water (probably more like 100'-150'). I am sure the images break down, but I can't find out how much. Can I see a 20' boat clearly down at 150' or is it a speck on the screen that would take years of practice to notice? Would I "need" a towfish? I thought there was a transducer for deeper stuff, but I'm not sure whether that is needed or not.
Any help here would be appreciated. If you can point me to "SI for dummies" that would be most welcome as well. I have the basics I think, but maybe not.
Thanks,
Chris
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Chris, your depth says you will probably want a fish...
However you can up your transducer power (1kw)(for a price) and get the deeper scans.
The bigger the screen the better the picture.
Now having said that you can also output your scan to a laptop (bigger screen) or record your scans and review on a pc program such as Humviewer or yellowfin..
Chuck
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Chris
For working in deeper water there is a 1kW transducer available.
*To obtain 8000 watts PTP requires the use of the optional 1kW (8000watt) transducer.
Please note: I think this ONLY applies to 2D sonar. Not SI or DI.
If I'm correct, a towfish would be a good option. There is lots of great towfish info on this site.
My guess is that the depths your talking about would push the outer limits of the SI and DI.
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The only operational differences between the 898/998/1198 units is the size of the display.
I doubt that these units would work down to 200 feet. The deepest that I can remember seeing a screen snapshot of an Si image is 182 feet deep.
newkid4si is correct: the 1KW transducer is a (50/200kHz) 2D sonar transducer only. If you select to use it he unit does not run the Si sonar at the same time.
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For what Chris wants to do he may consider a towfish. Getting the transducer closer to the bottom will produce a better display of a target.
(Chris check the towfish section of this forum)
Not real sure that going to the higher power will really help that much..
Has any one snapshots of a 1kw at deep depth?
Chuck
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Thanks all. This info is exactly what I need.
I was looking at the towfish section and it looks like you start to lose power to the transducer after so many feet of cable. If that's true, how do people get a fish to run deep? Or, how deep do I need to go to get decent images?
Thanks a bunch.
Chris
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Chris, there have been several ppostings on cable length and loss of signal but generally it is not of a concern for most towfish application.
I can lay my hands on the reference right now but if you search the forum you will find posting on just this..
We have several guys here on the forum that have done a lot of work and shared their findings with this group.
You just have to be creative on your search entries..
Someone had posted with information on cable types, lengths and signal loss..
Chuck