http://www.humminbird.com/360Imaging/ here is the newsest and greatest from Humminbird. It is like a talon pole made to be used when setting still the info gathered it seen as a radar screen and is relation to the boat. This will help you understand were the structure is related to the boat, so when making accurate cast you will make correct cast towards the structure. Cabelas is selling this awesome unit for 2000 dollars and can be added to your current si unit as long as it has a Ethernet port.