I find using google maps for arrival time etc is really hard while on public transportation. Before the trip starts, easy. Using it while driving? Easy.
But I haven’t found a way to keep it from getting confused and staying confused once the trip starts. I’m hoping someone figured it out and there’s something I missing. Even when mass transit is the form of transportation chosen, the app generally doesn’t seem to be able to figure out I’m on the bus or train or whatever on the route. My experience is mostly in the San Francisco Bay Area.