A customer of my CarPlay adapter bracket made this brilliant YouTube video, showing the setup. Thought I'd share for anyone who may require:
Yes unfortunately the screens serve little purpose without a phone connection. The reason they are so affordable is because most of the computing power comes from the connected smartphone. I would say that the likes of a tomtom would work far better in that case.
Test_driver - your current landline phone will be inoperable in a year or two owing to fibre upgrades.
Thanks for that. I will stick with my TomTom then.As long as you have WiFi, you will still have access