Does Google Maps turn-by-turn on iPhone use much data?

I can't find out. I can find out about the Apple Maps, and the old Google maps that were included on iOS devices, but I can't find any information on data use for the Google Maps that offers turn-by-turn navigation.

And I mean how much data does it use to deliver spoken directions, mapping imagery, etc.

Google maps use much of the data when they are turned on. If you want to minimise your data usage then turn off location services from settings. And only turn it on when you need it.
google maps doesn't provide that information for data usage history

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