Do we still need GPS when we can use Smartphone?

[tsupermario]

I've been using my iP5's google maps since owning it last January and it never fail to amaze me. I just kept it plugged in the charger to avoid battery issues.
The reliability is top-notch (when all you need is directions from point a to point b) and the added features are just icing on the cake.
I have an in-built gps in my Nav but the last time I used it, it led me to an unknown road and ended up travelling farther than usual.
I won't say it was the Nav's fault. More of me not learning how to use it properly.

I've heard Apple's own Maps has night mode already, but I prefer Google maps so I haven't tried it yet.

I use google maps, iOS and android version, and I prefer using the latter. I can't seem to find the option to save map offline in iOS.