I installed 2 Helix 9 MEGA DI and SI on my boat. The guy I bought them from didn't tell me about the transducer program from Humminbird. Now I will have to pay again to get the best performance JUs wondering if it is worth it. Would my Helix 9 MEAG SI and Helix 9 MEGA DI use the same Transducer? Can I jus install one on the transom and connect both units to the HDSI transducer. So much for me to learn. Thanks in advance for a help.