Electronics will show the cover and fish on it...most have an SD card or you can download snapshots...we have a buddy who has "TOP OF THE LINE" electronics and takes "pictures" for us so we can see how he cover is doing!
We have taken the 90/10 rule and blown it away...we now have fish in 90% of the lake during the Spring, Summer, and Fall...between the Crappie, Walleye, Perch, Smallmouth, Largemouth, Warmouth/RockBass, Bluegill, Channel Cats, Shovelheads, Blues, WB, and the Native baitfish and shad...there is hardly a spot in the lake that your elctronics don't light up!