[dlcarrier]

It doesn't need to be logged on to a Google account, and it supports locally storing map data and generating routes, so you could turn on network access, download local maps, block network access, then use it for navigation without it calling home.

[goda90]

There's also value in live traffic and road closure information.

[dlcarrier]

That's a more difficult one, because that traffic data itself is aggregated from location sharing.