I am thinking of upgrading my Lowrance 520C (on my console) to a HDS Touch bundle. I'm not real up on the technical aspects of the electronics so I have a couple of questions. My 520C transducer is listed as a straight 200kHz with a 20 degree cone angle. The Touch is listed as 83/200 kHz. They both have the blue plug. My power plug is also blue. I rarely fish over 30' and never over 50-60'. Here's my questions.

Can I just use the transducer from the 520C? If so, is there an advantage to using the 83/200? Should I just use the old transducer and power cables and then only have to install the structure scan transducer? And, if so would I still get the benefit of the overlay?

Thanks,