Meter App defaults to using the default based on your device's region and locale settings. You can switch between miles and kilometers in the settings tab.
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Once a fare is created, you cannot change the unit. You must delete it and create a new fare after changing the unit settings. When the Meter starts, the unit from the selected fare is used.
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If you notice the map/fare/distance stop updating while driving through tunnels, please contact support with your Android version, Meter app version, and whether the trip timer continues. Our team may need logs to investigate.