Humminbird HDR 650 Digital Sounder - Round Bezel c/w Transducer

What is the length of the chord to the transducer?

does the Humminbird 407860-1 HDR650 Digital Depth Gauge come with a transducer cable or is the cable sold seperatly?

Does this unit allow you to adjust offset for the keel depth?

I have a previous generation of this, Is everything compatible? For example if i only replaced the display wound it still work.