title: iOS navigation app with multiple & offline maps: which library to use?
body: <p>i'm stuck with problem of what lib to choose for my nav app project.</p>
  
  <p>At the moment there is:
  1) route-me
  2) Alpstein route-me
  3) mapbox-ios-sdk</p>
  
  <p>What is the difference between them all? What to choose as a foundation for navigation app?</p>
  
  <p>Requirements for my app:
  1) Multiple maps available
  2) Multiple selected areas of different maps to work offline</p>
  
  <p>Thank you a lot!</p>