Got this over the winter.tried it out once,finally warm enough .water was 51 degrees.found a school of big perch got 2.cast the sonar around some more,found the shellcrackers got 4 missed 5 or so.but it worked,set the chirp for 47 degree cone angle ,showed hard / soft bottom ,emergent weeds.rock piles.great bank fishing tool.perch were loaded with eggs ,shellcrackers no eggs.fish were cold to the touch still.worth the money,upload the app prior to heading out,no cell service reqired.wifi localized.