In this video I explain what Time Variable Gain is (TVG) and how it effects your sonar picture!
A lot of people will tell you to set it at "Low" or "Off", but not many people can explain WHY!
There's not a ton of information out there to explain this vaguely covered topic, so I found as much as I could and tried to make sense of it. Different brands of fish finders might calculate TVG a little bit differently or have more customization on how to adjust it, but in the end, they all produce similar results.
I want to add this disclaimer: The information presented in this video is MY interpretation of the vague info I could find online. That said, it makes sense to me, and I think it's pretty accurate.
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