I asked this in another post, but maybe buried down a bit too much. From the brochure I received from the dealer, navigation looks standard on the 2015 models, while it is only available as standard on the 2016 HSE Lux and as an Option in the Driver Assist package (with other gadgetry I'm less interested in). Is this true? Or are there 2 tiers of nav, a standard nav vs some upgraded version of it?