This is actually the reason I stopped using Google Maps for most of my navigation. It used up most of my 5 gb monthly allotment over the timespan of a week of travel/driving.
I typically only use ~500 mb of data per month otherwise.
A lot of places outside of US (like Tokyo for example) simply don't support offline caching mode, which makes google maps a real data hog when you travel.
Yes, that's what I've done for my home city, but it's not especially practical when travelling, when compared to other mapping apps that let you download entire countries' map data at once.
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