This article provides an overview of location services and GPS features.
INSTRUCTIONS & INFO
Location Services allows location-based apps and websites (including Maps, Camera, Safari, and other Apple and third-party apps) to use information from cellular, Wi-Fi, and Global Positioning System (GPS) networks to determine your approximate location. For example, an app might use your location data and location search query to help you find nearby coffee shops or theaters, or your device may set its time zone automatically based on your current location. To use features such as these, you must enable Location Services on your device and give your permission to each app or website before it can use your location data. Note: For safety purposes, your iPhone's location information may be used for emergency calls to aid response efforts regardless of whether you enable Location Services.
You can turn Location Services on or off at Settings.