To use offline navigation, you’ll first have to download the part of the map that you need for your journey. You could do this before, but it didn’t allow for turn-by-turn guidance. Needless to say, you can’t get live traffic info though.
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You can, however, access info about places, like hours of operation, contact information and ratings while offline.
Once you have a section of map downloaded, the app will automatically switch into offline mode when you lose your connection.
Google didn’t say exactly when the feature will arrive for iOS users.
➤ Navigate and search the real-world … online or off [Google blog]