How to Build a Location-Based App that Goes Way Beyond GPS
For GPS-based iPhone apps, use Apple's MapKit + Core Location; for Android, use Google Maps; with cross-platform app development, choose Google Maps. Begin location-based mobile app development by creating a working prototype, cleared only to the geolocation feature that is the core of your app. For more details on how to make a location-based app, skip to section 6 and look at tricks with power optimization, offline mode, and opt-in implementation.
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