Hello Tatted64,
You should be able to hear voice navigation from your car speakers using a USB cable, with Google Maps. Here's how:
"Use a USB cable
- Set the source for your car’s audio system to USB.
- On your iPhone or iPad, open the Google Maps app .
- Tap your profile picture or initial >Settings > Navigation settings.
- Turn off Play voice over Bluetooth.
- Connect your device to your car with the USB cable.
- Start navigation.
Note: Use a charging-only USB cable or a power adapter that’s connected to an outlet or cigarette lighter.
Step 5: Download voice directions
- Sometimes voice directions aren’t downloaded or must be updated on your device. When this happens, you’ll hear a chime instead of voice directions.
- Make sure you're connected to the internet. If you have a strong internet connection, voice directions download faster.
- Get directions.
- Use the Google Maps app as you normally would. Voice directions are downloaded while you have the Maps app open.
- When the voice directions are done downloading, you'll hear directions instead of chimes when navigating to a place."
More details here: Google Maps Help - Fix voice navigation problems
If you need further assistance, we suggest that you connect with Google here: Google Maps Help - Help Center
All the best.