Checkout the early version of Sygic offline GPS Navigation for Apple CarPlay. After the release of iOS 12 you will be able to enjoy all the advantages Sygic provides even without internet connection. Including offline maps with lifetime free updates, Speed Limits, Predictive Routing, Lane Assistant, Voice Navigation, Real-time Traffic Information or stunning 3D modeled buildings.
Take a look at the video below! You can download Sygic GPS Navigation & Maps from the App Store for free.