i made this post for all to use ,some may not need this at all .i know we have new members and i recall one said they have pond fished only no lakes.being in back of the boat or the boater ,i feel both need to understand the graphs and what u look at on screen . operating these fully is only 50% of the battle and the other 50% is the guy with the pole and how he uses that to his benifit .

here is some links for  down imaging ,side imaging and 360 imaging 

i personally learned more about the 360 from this and the gentleman explained it very well ... I HOPE YA'LL ENJOY THIS

https://www.youtube.com/watch?v=frLnCcIpoaE     PART 1

https://www.youtube.com/watch?v=3kGfIjFnHFM   PART 2

https://www.youtube.com/watch?v=lL5Hy4lKnss    PART 3