The interesting app that shows you TWO maps (from different map providers) at the same time is available on AppStore! https://itunes.apple.com/us/app/tandem-map/id588118181?mt=8&uo=4
You can search the Foursquare database for locations, check them out on the mapS, add them to your address book and/or add them to My Places.
Details can be found at: http://www.onegoodapp.co/index.php/en/tandem-map
It is free now!
Enjoy!
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