I'm looking to trade my unit listed above for a 858c hd DI and some cash to offset the value. Or maybe even a 958c HD.The reason for trade is this is on my bow and I have no need for the SI. Figured it would get someone a chance to get a SI unit. I figured all we will need to swap is the head unit and the transducer. The SI transducer I am using I have it mounted to my trolling with a tranducer shield for my trolling. Serious inquiries thanks!