At the top of the dodger it has 5 small holes to set your mainline. Each hole will make the dodger swing away from the boat. The diagram on how to use these holes is right on the dodger for easy reference. This feature is great when you are fishing near the surface because it acts like a side planer and takes your presentation away from the path of the boat. As the fish move away from the boat they are pushed to the side directly into your presentation. This feature also comes in handy when you are stacking lines off the downrigger. Each line can be offset from the other to help avoid line tangles.