How important is separating the power source to reduce RF? Very small boat with only TM for propulsion.

I have read many threads on RF with lots of different answers. Will a choke or/and twisted pair allow noise free operation of a FF with a digital motor on the same battery? Application is O.T. Ambush, M.K. Endura Maxx 45, Lowrance Elite 4 Chirp (yes I need chart plotting for expansion purposes).

You may have noticed this is a bottom dollar, skinny water build with best of class combined. I expect controversy and will appreciate all replies, especially concerning the ff since that is the last piece.