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The only driving App that comes close is called Waze.
It has lots of "social" features built into it:
Waze is a free social traffic and navigation app that uses real-time road reports from drivers nearby to save commuting time and improve your everyday driving. Way more than just another free navigation app, waze's social layer is what sets it apart - giving drivers the power to work together to report and receive the most relevant traffic information available at any given moment.
I use CoPilot as an offline backup GPS app, for when you're out in the sticks and lose your data connection. It's rarely needed, but I got it for $5, and it's totally worth it. The other 99% of the time, I use Google Nav.
Google Nav syncs your entire route offline. They added this a while back. I have no idea why we're even discussing other nav apps.
However, if you're out in the middle of nowhere and lost, and you pull out your phone to try and find your way home, and you have no cell service, Google Nav will be of zero use to you. That hasn't changed.

Also, cached maps are automatically deleted after 30 days as well.