Donut path is a straight line between two waypoints and their associated altitudes in the RH column of F-PLAN A. So in this case that is from CF at its' altitude, and RW and (normally) RW Elev plus 50' , both inserted by the database.
With GPS PRIMARY it is pretty accurate (see MERIT) but not as accurate as ILS GP.
Without GPS PRIMARY it could be miles out.
Use as a guide but treat with caution, is my advice.