I am thinking of using the Lowrance Elite 5 ti on the front of my boat. is the five-inch big enough for clarity? Also, i saw several websites with refurbished units at discounted prices. In your opinion are they worth the discount, do they last? i am torn between the Hook2 7 w/ triple shot and Elite 5 TI. I heard that the elite models you can wifi with a tablet. I took my i pad on the boat and attempted to use it but like some have said it was hard to see.