Price: $0.99 for two maps of your choice. Free version has sample offline map to Berlin

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Alternatives: Android users will be able to use Google Maps offline; the feature should be rolled out soon. Meanwhile, they can try , which uses OpenStreetMap to provide worldwide offline maps.

Unless you've got an unlimited bank account, you're going to want to avoid international data roaming charges when you're traveling abroad. That's where apps such as OffMaps 2 come in.

OffMaps 2 offers offline maps for thousands of destinations, both in the U.S. and internationally. For $0.99, the app allows you to download two maps of your choice. Should you need more, the price is $0.99 for three additional maps, or $5.99 as a flat rate for as many maps as you like. Map updates are free.