Humminbird Side Imaging Forums

General => General Discussion => Topic started by: JohnIrish on April 03, 2013, 01:56:05 PM

Title: SI for Deep Water?
Post by: JohnIrish on April 03, 2013, 01:56:05 PM

I am looking for a new depth finder... I fish the Columbia river for walleyes (north of Grand Coulee Dam)  and often the water is very deep.

It is not uncommon for the depth to drop to 200 feet at 100 to 200 feet from shore.  Often it is over 50 feet not too far from shore.  Most of the uses I have seen for side image has been in shallower water.

Will the side imaging still find structure at the deeper depths?  I am thinking that I would cruse the shoreline and scan out to the deeper water.  I would then be only scanning one direction.

Can I find drop offs and submerged structure at those depths to help with walleye or small mouth fishing?  Or would I be wasting my money on the more expensive side imaging units?  How far to the side could I look?

thanks!

Title: Re: SI for Deep Water?
Post by: Rüdiger on April 04, 2013, 03:36:52 AM

Hi John

Welcome to the forum :)

The SI function only goes up 150 feet, greater depths can be achieved only with a towfish.
A sonar image requires some practice in the interpretation, there is good information as it looks below.

mvh
Rüdiger

Title: Re: SI for Deep Water?
Post by: sjefsrafsern on April 04, 2013, 05:52:56 AM

well it depends on water clarity, currents if it is saltwater or sweetwater. in some mountan lakes you can actually have side imaging down between 200 and 300 ft deep. but this is in extremely good conditions for scaning. :) but in salt water and muddy rivers i dont think this is possible.

mvh stig