What about using my phone for navigation?
If you use your phone for navigation like Google Maps or Waze then this works with Echo Auto too. Once connected you'll get the navigation directions through your Echo Auto - using the default navigation app selected in your Alexa app. Open the Alexa app, head into settings > traffic > default navigation app and you can select the app you want Alexa to use.
Then when you ask for direction, Alexa will trigger that app and open it on your phone. You just have to make sure you're precise with your destination requests, although Alexa is smart - and you can ask for shops or restaurants, for example.
If you are using a service like Waze that integrates streaming music services, you're better off using Alexa to control those services via voice, rather than using the in-Waze option.
https://www.pocket-lint.com/cars/news/amazon/152634-how-to-setup-your-amazon-echo-auto/