Controled VFR is authorised in Canada to 17 500ft. You can find the specific in your AIP under the RAC section (RAC 5.6) but basically you need a CVFR flight plan, a CVFR clearance and be able to navigated as if you were flying IFR and remain VFR in VMC. The only benefit is that one needs no IFR qualification.
Cheers.
D