Hands-On: Android 4.1 Jelly Bean
Replying to: Once a map is downloaded where do you find it on the phone? by Jayshmay
You access it from within the Maps app.
It's not a picture file of a map. It's all of the data that Maps would need to make Maps work, including streets, addresses, landmarks, etc.
So you go back to the Maps app, go to My Places, and go to the Offline tab. (Although I'm not even sure you need to do that.) Just go to that city/area and start using Maps as usual.
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