GPS (Global Positioning System) is used in the Waze app to get your position and display it on the map. Your phone receives the GPS signal from a number of satellites via a GPS antenna which passes the GPS signal via a driver through to the app. The Waze app maps the raw gps location to the map as the blue arrow (if using the standard pointer).
Possible problem sources:
- the number of available and used satellites
- your phones GPS antenna (beware of metallic objects blocking the antenna)
- the software on your phone (beware of battery saving turning off GPS, switching between apps)
- Phone settings: ensure that your location services are enabled.