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FYI the later model year C-Max (definitely 2017+ but maybe also 2016) no longer use SD cards. The only way to get updated maps for the built-in nav is by paying the highway robbery fee. Built-in Nav is a huge rip-off--always has been. I think that's the biggest reason the car companies dragged their feet on CarPlay/Android Auto for so long--they knew they would be losing a monster cash cow over the years as people realize it's better and cheaper to just use their phone's navigation. OP, if you really want updated maps, I think the download option would be the way to go. From what I understand they make the process pretty easy, and as long as you have a decent-size USB flash drive you should be fine. I'm sure their support people will assist if you get stuck. But if you're doing it expecting the new maps to be much improved over the 2016-era ones you currently have, you may be in for an unpleasant surprise--sometimes changes/new construction takes a couple of years to make it into these static map updates. Yet another advantage of the Apple/Google maps--they are far quicker to update their maps with changes. Just my 2c