I have a carbon 12 with LSS2 and a shoot thru hill 2d transducer. The 2D went bad. Should I knock out the 2d sonar and upgrade to the AI 3 in 1 or just replace the thru hull? Would I lose anything with the 3 in 1 other than being able to see the bottom on pad? Does the 3 in 1 allow me to see both 2d and structure scan at the same time? Thanks