If you are going to be fishing as deep as 200', I would wait a little longer while info on the Helix 12 rolls out to find more detail about the chirp ..... It can do chirp with the standard transducer...or add on transducer for better chirp.
The transducer details for the add on chirp transducers is not matured yet.
If you frequent BBC boards, there are some images starting to show up over there.