Originally Posted by Lammy
For the entire US? I've only been able to download particular areas and you can't search for anything.
^This. Even if you save a google offline map, search results are unreliable without cell data.
A standalone GPS or Navigation builtin Audio Head Unit are built without the intent of cell data. While they may not always be as precise as google or apple maps, they do a decent job from anywhere you can get GPS signal.
To the intent of the OP: Only a Chrysler unit will be fully plug and play. Any good brand navigation head unit will support adapters for Steering Controls, and some support the Maestro system that integrates the rest of the Uconnect systems.
The Chrysler unit is way overpriced new and has poor sound quality and configuration.