Data plans can be exceptionally expensive and carriers will often bar messaging and call services from being used over them. You know you can’t use your carrier’s data plan to FaceTime mom and will instead have to pay the carrier a different call rate. Your carrier’s data plan will let you browse the internet, Tweet, post to Facebook, or find a place on a map. If you’re using a small data plan and trying to conserve bandwidth, the maps app is one place you can cut back. If you use either Google Maps or Apple Maps, here’s a little trick to using it offline.
Google Maps has an offline mode that lets you save an area of a map offline. It covers a reasonably large area and you can zoom in down to street level if you want to. To add an offline area, open the Google Maps app, tap the hamburger icon at the top left and select ‘Offline Areas’. Tap the plus button and select the area you want to download. If you’ve selected an area that’s too large to be downloaded offline, Google Maps will warn you of it and ask you to zoom in. Name the map and download it. You can access it when you’re on the go without needing to switch on your data plan.
Reference Article: http://www.addictivetips.com/ios/how-to-use-google-maps-apple-maps-on-the-go-without-a-connection/