C.B. primary and only approved navigational source is approach plate NOT the BOX. FMS is just advisory and in case of discrepancy Jeppesen prevails. That's how simple it is. You may elect to use it at your own peril and fly it out of the box.
If the title was, NDB or GPS approach then I wouldn't need to monitor the raw data but simply fly it of the box. Since it says NDB that's the primary navigational source. In case I lost both FMS I still can fly it following the needle unlike GPS.