Being perfectly synched means, you get notified for any updates.
So, even when the passenger is on board, he can locate the route their ride is taking on their app. This is how the passenger will also know the exact miles that has been travelled and when the price is sent at the end of journey, it is calculated accordingly.
Passengers can also send their location to their loved once while travelling alone. The system will always be there in the entire time of the journey whenever you need.