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Offline maps overview
With offline maps on Google Maps for Android, you can view a map even when you aren't connected to the Internet. To create an offline map, select and download a specific area on the map.
Benefits of offline maps
View step-by-step list
No data plan? Download certain areas of Google Maps to your device for use in places without an Internet connection, or if you're outside wi-fi coverage on a phone without a data plan.
Poor reception? Use offline maps in locations where you can’t get a good signal.
Don’t have unlimited data? Save on costs associated with accessing Google Maps on a mobile network by using offline maps instead.
Google Earth works best with a live internet connection. You can, however, cache (save) small amounts of data that you can access when you're offline.
To do so, log on to the internet and visit the imagery you'd like to view while you're offline. Please pay attention to the Streaming indicator, which appears just below and a little to the right of your images. When this indicator has reached 100% for the imagery you're viewing, Google Earth has gathered all available data for that specific altitude and settings, so you can disconnect from the internet.
Please remember that once you're disconnected, you'll be able to view cached areas only.
Google Map/Google Earth Terms of Service that I had seen in more than one spot said live link it, or you don't get it to use without violating their terms. I've moved to using a different map server entirely because of their demand that it be perma-stream linked to them with no "legal" option to present any of it, otherwise.