Es series 127 vs 128 MFD and sonar

[Lazybones]

It is my understanding that the difference between the eS127 and eS128 is 600W Digital Sonar vs Down vision sonar being built in.

1. Can both the 127 and 128 support either 600W digital or down vision by merely selecting and installing the appropriate transducer, or is that choice made exclusively by selecting either the model 127 or 128?

2. Will both the 127 and 128 also support displaying the older ST50+ depth readings when properly connected through either 0183 or seatalk NG if no new transducer is selected at this time.