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Discussion Starter · #1 ·
I've had a fish finder installed for two years now and I rarely if ever see fish on it. The depth and temp is accurate but rarely any fish.

For example, I fished Lake Mary this past weekend - caught fish all weekend fishing the weed beds in 4-6 feet of water. I could clearly see the weeds and the depth but never saw a fish on the graph the whole weekend. There has got to be a lot of fish in there and for not even one to show up on the graph seems impossible. I changed the sensitivity to various setting and still didn't see a fish.

If anyone know why this is I would really like to know. The graph is a hummingbird 525 fish finder.

Thanks
 

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thats why,i had a hummnbird525 and it sucked and it sucked since i baught it,go lowrance
 

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I have the same model and mine shows fish just fine, especially at nite when using a crappie light... But like Del was saying, shallow water spooking could be the cause of why you're not seeing anything.
 

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just tie on a big 9in hudd and drop it under your graph. should read.

if not, turn your sensitivity up.

worst case, turn fish id ON... Kidding, don't do that.
 

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How Fish Finders Work...

I've had a fish finder installed for two years now and I rarely if ever see fish on it. The depth and temp is accurate but rarely any fish.

For example, I fished Lake Mary this past weekend - caught fish all weekend fishing the weed beds in 4-6 feet of water. I could clearly see the weeds and the depth but never saw a fish on the graph the whole weekend. There has got to be a lot of fish in there and for not even one to show up on the graph seems impossible. I changed the sensitivity to various setting and still didn't see a fish.

If anyone know why this is I would really like to know. The graph is a hummingbird 525 fish finder.

Thanks

SmokerRaft click on this LINK, it may enlighten you about your Humminbird 525



If the fish is off center, the display will show a portion of the arch figure. The amount of the arch shown on the screen depends on how much of the fish is in the cone shaped beam area of the depth finder. Figure 1 displays how this beam is shaped and what fish might look like in the screen if they are in different areas of the beam.
The transducers that are standard on most depth finders offer a I5- or 20-degree angle. In shallow water (less than 10 feet), for example, it is possible that the depth finder is reading an area less than 3 or 4 feet wide. (Notice the narrow beam illustrated in Figure 1). Additionally, in shallow water, the beam is much narrower than at the bottom, thereby having less of an ability to produce a readable beam on the display.

http://www.bassresource.com/fishing/fishfinders.html


How Fish Finders Work
http://www.fishingtells.com/Articles/article-19.html



How to use a Fish Finder!
http://www.youtube.com/watch?v=jcJE0fEsicI&feature=related
 

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Discussion Starter · #10 ·
I have the same model and mine shows fish just fine, especially at nite when using a crappie light... But like Del was saying, shallow water spooking could be the cause of why you're not seeing anything.
Ok lake Mary is probably a bad example............

When fishing Willow Springs I was consistently catching trout in 40ft and only a saw a few fish on the graph and they were always very large sitting on the bottom. I figured I would turn up the sensitivity because maybe the graph wasn't reading the small trout, I still failed to see any fish suspend in the water.

Are you guys able to see trout on the graph or are they too small?

Another question is when I turn up the sensitivity the surface gradually becomes a thicker and thicker black line, is that normal? How do you know when the sensitivity is just right?

Thanks for all the help though, probably going to have to just keep playing with it, or drag a swim bait under the transducer and see if it picks it up.
 

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When you are in 4-6 feet of water the transmission cone is small. Think of the transduce is where the cone begins and then flares out from this point to the lake bottom. On the lake bottom at 6 feet you have around a 2 foot circle and between the transducer and the bottom that are of transmisson gets smaller and smaller. A lot of guys turn off these systems in skinny water because of the noise that is being generated from the transducer.

A fish will not always look like a fish on the display (the arch we are wanting to see). It might look like a small straight line if you are moving in one direction and the fish is swimming in the opposite direction. A lot depends on what the fish is doing when you pass over it and then the time and speed you are traveling. Then the area of the cone. If you are in 6 feet of water with a cone that is 2 feet on the bottom of the lake that means at 3 feet the cone has a circular width of 1 foot. And even then only about 1/3 of that area is full power. the outer 1/3 and 1/3 are a percentage of the power coming off the transducer. In this area fish might be a few dots or a broke line on the display.

I attended a Sonar presentation by Don Iovino a few years back at a BassMaster University seminar over at Glendale Community College. He knows his sonar well. I bought his tape and watched it but wanted more.

http://www.iovino.com/

Someone on this site posted about a guy back around Michigan that made some tapes. This guy has some great information but his fisrt tape IMO was poor. It was like he had no script and was just blabbering away. I bought his DVD. They are available at Sportsmans Warehouse and a lot cheaper than buying from him directly.

http://www.hightechfishing.com/sonar.html

Now what I consider some of the best so far and I recommend these DVD's from Wilson Frazier. I bough his first 2 DVD's and I am really pleased about what I have seen on both his presentations. I look forward to his next DVD that will be released soon. He puts things IMO in proper prospective.

http://www.itainttv.com/index.php

I know that Wilson Frazier has some clips on YouTube. Try typing in Iovino and Sampson too and see what comes up too. Also go to the Lowrance website and they have some free information on sonar and GPS.

All 3 of these guys are using Lowrance systems. But beyond the controls, Sonar is sonar and you might find these presentations useful.

I have emailed Wilson Frazier about coming to Phoenix and putting on a few presentations.
 
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