Recently, it has emerged that Google is developing a new feature for Google Maps. Interestingly, it just looks like this feature is coming to iOS as it already exists for Android.
The feature that Google is getting into Google Maps for iOS will let you who have an iPhone or other iOS device in the future say "Ok Google" for navigation instead of "Hey Siri".
It remains to be seen when Google will release this feature but hopefully it will be soon.
Google Maps is working on “Ok Google” for iOS which overrides “Hey Siri” while navigating pic.twitter.com/1n5QIOWTXR- Jane Manchun Wong (@wongmjane) June 20, 2020