If you go with Lowrance, don't get a Elite series. I bought a Elite 5 DSI in January of this year and sold it in the spring. The gps in them is not suited for spider rigging, with mine at anything less than .6-.7 mph the icon repesenting boat location would stop moving. Then when you sped up it would move to the correct position. As a test I marked a way point when I knew the icon was not in the correct location to see if it would mark it at the icon or the actual location. It marked it at the actual location, I tried it several times with the same results everytime. I don't understand how it could mark the way point on the correct spot but the icon be off somewhere else, I guess thats why I'm not an electrical engineer :D.