With these new units you will find that there are many to pick from. Down scan and side scan can be a great tool. I have my two Lowrance tied together so I can see the side scan at the front of the boat when spider rigging. I have really enjoyed using these units but am still learning all the things they can do. Take some time and look over some of the post on this forum http://www.crappie.com/crappie/side-down-imaging/
You will see what the units can do and maybe this info will help you.