GPS

GPS (Global Positioning System) uses signals from approximately 30 orbiting satellites to determine ground position. Smartphones have built-in GPS receivers, providing 3-5 meter outdoor accuracy. A-GPS (assisted by cell towers) reduces initial fix time.

QR codes combined with GPS power location-based services. Tourist stamp rallies verify visitors are at the correct checkpoint by checking GPS after QR scan. Store QR codes that launch Google Maps navigation are another common GPS integration.

QR codes can store coordinates directly using the geo URI scheme (geo:35.6812,139.7671), launching map apps to display the specified location. This is used for event venue directions, real estate property locations, and emergency evacuation point guidance.