Hello, I am about to put new electronics on my boat. I am looking at the Lowrance HOOK2 9 with tripleshot sonar. My question is can i link two of these units together(one at the wheel, one at the front). If so will they use the same transducer, if not will having two transducers on the back of the boat effect performance of the transducers? Thank you. Also if any of you are selling old systems please pm me what you have.