The TZT9F uses a 10 pin transducer. Most of the single freq transducers supported can also be used with the TZT12F/16F/19F if you used the provided 10 to 12 pin adaptor that comes with the MFD. If you have TZT9 with connected transducer as long as it is part of the network, other MFDs will have access to that sounder without moving the cable to another MFD. In case of TZT9F malfunction or removal from the boat, the transducer could be moved over to another MFD (using the appropriate provided adaptor)