I called SiriusXM because my SiriusXM Guardian subscription was about to expire and they wanted $259/year to renew. I never used any of the features, so I was going to cancel the subscription. The person I spoke with at SiriusXM said I had the best package, but I should look at less expensive packages, because if I don't have at least one of their packages, then my navigation system will no longer work. He extended my subscription for two months so I can check out their other packages (the least expensive was just the remote unlock feature for $149/year). I think this guy is full of ****, so I called my dealership and spoke to my service advisor. She explained SirirusXM Guardian has nothing to do with the navigation system, which operates by Garmin; very poor customer service from SiriusXM.