To mitigate this risk, Apple has decided to let off of the default apps feature, until a time where they can offer their users a more holistic solution. So, at this point in time, if you want to do your navigation in Google Maps, you will have to use it manually. Even when you receive map links on your messengers, you will have to manually enter them into Google Maps, as they will open in Apple Maps by default.
All in all, iPhones do not have the ability to set default apps as of today, but we believe the feature will make its way to the devices in a future update.
