I donít recommend learning to use ur side-imaging this way.
Thatís way too close to another boat that is on Fish. Most dialed in side image units are showing good returns up to 100ft. So, at best u are 30 yards away from the boat catching fish...risking blowing their fish for the sake of education. 30 yards is well within casting distance for almost all Anglers.
Really, you would need to be closer than 30 yards to get good returns...especially if the water was deeper.
Just not a good way to learn IMO...
Best way to practice is have your scan adjusted before you go pass peoples that are catching them and pulling them up left and right. Be careful not to disturb them and pass from a good distance away. I guaranteed you will see a bunch as you are passing by. That will give you a good idea what to look for. Dont bother with 2D it is useless in shallow water. You got a 7" screen not much room to see fish on both side. Might be better to turn off the left side or the right side and only scan one side. That way you get the whole 7" of screen and your returns is a lot more larger than trying to split the screen. I would stay on the very opposite side of the bank and scan all the sides of the banks that has sand dunes and sandy banks. That's where they're at most of the time anyway. Good luck Troy. Gonna be a good run this year. Miles and miles of river. No need to clump up in one area. If it don't produce in 15-20 minutes move to a different area. Don't waste your time working unproductive areas. All we need now is rain.