Educational Articles » humminbird down imaging

Will the northern eat the sucker? Posted on October 10, 2018

Mostly fun and a little education.

Humminbird down imaging

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Fish or weeds? Posted on July 15, 2018

Just another example on why down imaging helps sonar interpretation. The weeds look similar to fish.

Weeds or fish 1

 In this one the fish look like weeds.

weeds or fish 2

How to find your fishing spots with your Aqua-Vu Posted on June 02, 2017

I use sonar to find fish every time I go out but sometimes the fish can hide. Two good examples are boulders and steep drop-offs. The sonar beam is reflected off the bottom on steep drops and off the boulders and the fish can’t be separated.

I drove over this drop-off that had boulders and didn’t see any fish with either the Humminbird or the Lowrance.

Humminbird Sonar

I stopped on the edge and used the Spot Lock feature of my Minn Kota trolling motor on the edge and dropped my Aqua-Vu camera down and found these crappies but not just here but each time I moved along the edge there were more crappie.

 

crappie

Watch crappie video here

Even the down imaging couldn’t separate the crappies from the boulders while I was sitting over them.

down imaging

Notice the crappies are very close to the boulders in the video.

 

They did bite and they posed for the camera before being released (I had fresh walleye back home).

crappie

 

Understanding the lake bottom with sonar and Aqua-Vu Posted on March 02, 2017

I produced this short video using sonar, down imaging and an Aqua-Vu to show you how I interpret sonar.

Click on image to view video

Understanding weeds, bait and fish with sonar and Aqua-Vu Posted on January 24, 2017

Watch the short video to get an understanding why weeds are important for fishing.

Watch Video

Humminbird down imaging

Lost Fish, How To Find Them With Sonar Posted on December 13, 2016

Ever wonder what to do when you are slowly moving jig or rig fishing and lose the fish on sonar?

I had these fish near weeds located with down sonar (2D and down imaging).

If they disappear I look at the side imaging on a different screen to see if they are left or right. Like this image.

I place the cursor on the fish on the side imaging and create a waypoint and then move the boat to the fish before they move too far. It is easy, once you catch a few fish this way you add it to your fishing tools.

Learn Sonar Session 16 Posted on July 27, 2016

Interpreting sonar, down imaging and side imaging is very difficult. I have 3 great images to use as examples for teaching interpretation of sonar.

The left side imaging is showing the drop-off as dark (yellow arrows point to the drop-off on the map and side image). Bright is the strongest return and black is none. Since sound goes in a straight line the drop-off is dark.

The red circle is showing fish on the shallow side and I think they are about where the red arrow is pointing on the map. I would mark a waypoint on the side image and cast to the fish since they are shallow. Notice the boat is in 2.9 feet.

The next image shows the drop-off as dark (red circle) and fish are suspended near the drop (yellow arrow). Fish show up well on side imaging since they show up as bright on the dark background. Hard bottom is also bright which makes fish difficult to see on bright background.

This is an amazingly clear image of boulders (green arrow) next to trees (yellow arrow) that slid from the bank into the river.

The red arrow shows a fish in the trees and the white arrow shows a small drop-off.

 

Down Imaging and 2D sonar for Understanding Sonar Posted on June 30, 2016

Don’t miss supper, get better at sonar and fish where there are fish. Use the splitscreen sonar and down imaging and compare the two and you will become an expert.

Down imaging has a narrow wide cone and the 2D sonar has a round cone so they view targets differently and comparing the two makes interpreting sonar much easier.

This image is showing trees and the 2D sonar on the left is difficult to interpret but the down imaging shows the trees well.

Humminbird down imaging

This image shows fish on the side of a boulder but the down imaging shows 2 fish and I get much more excited seeing two fish than one.

Humminbird down imaging

This image shows 2 bait balls in weeds (yellow and green arrows) that the 2D sonar looks like weeds.

Humminbird ONIX

This image looks like stacked fish because of the arches but it is a common when you have posts or trees.

Lowrance DownScan

On this image the bait ball and the larger fish near it are missed with 2d sonar.

Lowrance DownScan

I see images like these everyday on the water since I usually run down imaging with 2d sonar. If you miss a fish on sonar you may miss supper.

Understanding DownScan/Down Imaging 2/25/2105 Posted on February 25, 2015

DownScan Interpretation


This explanation is to help explain what you see with down imaging, it is pertinent to all brand’s down imaging.
Down imaging has a wider cone and will show targets off the side better than the 2D sonar (traditional sonar 200 kHz).
Notice the man-made structure plus the rocks.
Sonar tells us the distance to the target. The man-made structure pointed out with the white arrow is 8 feet from the transducer. How about the red arrow? It is pointing at rocks and long strips of something man-made. You can’t tell which side it is on since the left and right edge of the cone is combined, something 12 feet from the transducer on the left with be superimposed on something 12 feet from the transducer on the right side.


If you have side scan you can see which side of the boat a target is.
Notice the rocks are opposite the man-made structure but on the DownScan they are overlapped.

The next example shows fish by a tree on DownScan and the side scan shows the same fish to the left side. The problem is we don’t have enough screens to show all we want. I like to see the map, 2D sonar, down imaging and side scan and that is a lot of dash space to be used. I like one model with splitscreen sonar and DownScan and one splitscreen map and side scan with the side scan using 2/3 of the screen since wide screens are best for side scan like I used 2/3 for sides can in the image.

 

Humminbird Down Imaging 6/22/14 Posted on June 22, 2014

Learn how to interpret your Humminbird

 


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