Does the fishfinder carp lakes app actually work?

https://play.google.com/store/apps/details?id=com.zeustechnocrates.fishfinder&hl=en

I would like to know if this app, known as fishfinder carp lakes is a real app that actually works. The description of the app itself even admits that its a good way to fool friends. Its $4.99 and I don’t want to waste my money on an app thats just a joke, im looking for a serious fish finder app.
Actually a real fish finder app does exist, How it works is that it uses a floating bobber to contain all the components. You tie the bobber to your line and cast it out into your fishing spot, this bobber contains electronics that send sonic waves down into the water (just like all other fish finders do) then using bluetooth it wirelessly connects to your phone and uses your phone screen to display what is under the water. The only problem is that it costs $300 for the special bobber and I’m not sure how comfortable I would feel about casting a $300 bobber out into the water. Also it wouldn’t work while your moving in your boat, making its uses strictly for when your anchored down or fishing from shore. So this is why I’m looking for a cheaper version for now.
Actually a real fish finder app does exist, How it works is that it uses a floating bobber to contain all the components. You tie the bobber to your line and cast it out into your fishing spot, this bobber contains electronics that send sonic waves down into the water (just like all other fish finders do) then using bluetooth it wirelessly connects to your phone and uses your phone screen to display what is under the water. The only problem is that it costs $300 for the special bobber and I’m not sure how comfortable I would feel about casting a $300 bobber out into the water. Also it wouldn’t work while your moving in your boat, making its uses strictly for when your anchored down or fishing from shore. So this is why I’m looking for a cheaper version for now.
Actually a real fish finder app does exist, How it works is that it uses a floating bobber to contain all the components. You tie the bobber to your line and cast it out into your fishing spot, this bobber contains electronics that send sonic waves down into the water (just like all other fish finders do) then using bluetooth it wirelessly connects to your phone and uses your phone screen to display what is under the water. The only problem is that it costs $300 for the special bobber and I’m not sure how comfortable I would feel about casting a $300 bobber out into the water. Also it wouldn’t work while your moving in your boat, making its uses strictly for when your anchored down or fishing from shore. So this is why I’m looking for a cheaper version for now.

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How does a fishfinder work?

I recently purchased a fish finder and I have never used one before. My only issue with understanding how to use one is that the one I have projects a two dimensional image. I have a couple questions about this.

My first question is since it only projects a 2D image, do I have to position the transducer a certain way? For example, if I point the transducer north, will it give me the reading of the lake bottom pointing directly north (directly where my transducer is pointing?

If I anchor the boat so I do not move, why does the screen still scroll?

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What is a good fish-finder and/or depth-finder for a 14 foot fishing boat?

Just got a little 14 foot fishing boat and I am looking for a fish or depth-finder for a Father’s day gift for my husband. I know next to nothing about this item, so please help. First, what is the difference between a fish finder and a depth finder and can I get a product that does both. What about having a GPS with it? Primarily fishing in a smaller 9 foot deep lake in Michigan (Lily Lake in Harrison). Any information would be greatly appreciated, such as prices I can expect to pay and where to shop.

I generally have a difficult time finding a great gift for my dear husband and really want to nail it this time. I am looking to spend around $200, but if you have suggestions out of that range, I will check into those, too.

Thanks in advance.

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