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Google Trips App

We have been on trips abroad where other people have apps on their phone that shows them the walking path between two points of interests within a city.
For our upcoming trip, I am saving points of interests within each city we will be visiting in my Google Trip App. Both my husband and I will have an international phone plan. I would like to know what on my iPhone needs to be turned on for the app to work; that is route a walking path from where I am to a point of interest.
Please be specific...kind of “techno-challenged:”