Vx2 doesn't offer a built in sounder like TZT2 and TZT3. The only transducers they can run without a sounder is the NMEA 0183 smart sensors like the 235DST. They would only provide digital depth and temp not bottom viewing. If wanting a fish finder for the Vx2, you would be looking for the BBFF1, BBFF3, DFF1, DFF3, or BBDS1. The BBDS1 would not offer BD or Accufish features. It would like the same as a DFF1 on the Vx2 system. The transducer would depend on the fish finder you get. You will need both pieces to have an operational network fish finder.