For any garmin echomap users what should the tvg and interference settings should be for all modes? Clear view 2d etc, I mostly fish in water less than 15 to 10 feet. 

I’ve left mine on the factory settings. So far so good.

I set it according to garmin.

 

TVG: depends on the depth and the image. it helps boost return signal brightness if you tend to get a weak return. The lower the setting the less boost, the higher the setting the more boost. If I'm struggling to get a decent image I'll play with this a little to get a better return. Typically I'm on Low.

 

Interference: Adjusts for any electromagnetic interference. According to garmin you should use the lowest setting possible to eliminate any interference. Should show up as lines in your imaging. Below is an example, you can either fix the problem or play with this setting to hopefully eliminate it. I run mine on Off with my setup.