Hi Sean,
I'm still having a hard time getting this. Apologies, it's over 20 years since I last flew and never had to deal with all the new tech. From my reading (lots and lots) it would appear Nav Canada is the wrench in the spokes for some charting options. I may be (likely) mistaken but I think Dynon, Garmin and others have access to the Jep library of Canadian charts and data etc for subscription. I don't mind paying and don't understand why some EFIS units can and others can't use the subscriptions. Why is GRT the odd man out?
R