Screen Shots - Basic Sonar/2D View

[zanzibarro]

I think it would be very informative to have a thread dedicated to the study of basic 2D sonar (or switch fire or whatever view it's called). It would be great if people couple post screen captures as a learning tool. Advanced lessons in terms of what we are actually seeing on screen shots. What I mean by that, or what type of screen captures I would love to see are:

Scale and speed: do you have a screen shot of a school of walleye in 25 feet? And what was boat speed when the screen capture was taken? Anyone have a screen shot of a school, whether large or small, in 35 feet?

I guess what I am getting at here is I want to know what some of the veteran spoon pluggers out there need to see on the graph before they sink a minnow. If you're graphing a mid basin reef at 3.5 mph in 30 feet the walleye marks are going to look a hell of a lot different than when slowly drifting In 20 feet, right? What do the marks look like can you show us?

I have a few screen shots on file I can post tmr to get thread going.

[TruthWalleyes]

BBC BOARDS - Humminbird Image Intrepretation.

All your looking for is already there.

[zanzibarro]

That is an impressive resource Truth. It does have a Walleye thread dedicated to answering the same questions I pose above, but contains no uploads/shots. Mostly Bass people catering to the South.

So if anyone has any MN Walleye captures I would still like to see em.

[reddog]

Not many 2D, but lots of SI shots of wall eyes. Pm me if you want a link.

[TruthWalleyes]

Reddog would be a great resource.

Only way to clearly identify fish on your 2d is to catch them.

2d lies all the time. Branch can look like a school... Etc. Combination on so and 2d and you can dissect about anything.

[JohnMickish]

I think its a great idea. I'll see if I can get a sticky on a thread To keep it on top. Give me a couple days.

[TruthWalleyes]

The question about screen and boat speed... You should match them.

I.e. chart speed 3 boat speed 3

Faster chart than boat, fish stretched. Look bigger than actual. Boat faster than chart. Fish shrunk on chart.

Adjust your sensitivity to get the amount of clutter you want.

[zanzibarro]

As Truth alleudes to above a margin of error will always exist when identifying species. Just post whatever you have in which you're reasonably sure. I contend the marks below are Walleye. We caught a few Walleye at time of this shot. They were eaters between 13-17 inches. That is what I believe we are seeing here. As to the tiny marks surrounding, maybe baitfish and/or some miniscule Walleye? This is Rainy Lake fyi. An 'Atta Boy' to the fish person to show me a school of Walleye (perceived/cuaght) in deeper water with a boat speed of 3.0 mph or above:).

[reddog]

If your on some kind of structure change in depth,(slope) with walleyes being the bottom hugging beasts they are, plan on them being buried in the 2D dead zone.