We locate you the most accurate way we possibly can - using the location services provided on your phone, including GPS. Location tracking uses a combination of GPS co-ordinates and local WiFi/3G networks to pinpoint your location. Is is essential that you follow the instructions given by the Safe Haven app to activate your smart-phone's location services. If for any reason your phone's location services are not active, we try to determine your location by speaking to you and your emergency contacts, in order to build an accurate picture of your most recent movements.