Axiom Standard version or all with Realvision & Sonar

[DRFASailboater]

I am wondering if when i go to purchase a Axiom display and when purchasing more then one for use at multiple stations on-board. If i should be purchasing Axiom displays with each having Realvision and Sonar or if one would only be required to have these Features to make use of a the thru-Hull realvision transducer?

Lets say i have three stations on my vessel and at each place there will be a Axiom MFD. I am considering purchasing two 9" and one 12" and i noticed that i could either buy just the display itself or a display with Realvision and Sonar600w. I take it that i would be needing the Realvision and Sonar at each station i would like to receive this detailed information at. But i would like to clarify this if possible. I'd be useing a Realvision thru-hull to acquire a underwater perspective of conditions and any fish about, as well.