I have a Certified Pre Owned SFS (2015) that when I purchased it, the dealer gave me 3 months complementary BlueLink.. Now they are asking me to consider renewing the BlueLink before trial expires..What exactly will I lose when BlueLink expires??? So far I have only received 2 emails of car maintenance reports.. I'm sure there are other items that I MIGHT USE but have yet to find them.. What do you think? Will the Nav System still work without BlueLink??... The dealer is vague when asked.. Opinions??