Much location detection uses WiFi mac addresses sucked up by stuff like street view cars. Uses much less power. Google have an API to look up a set (min 4) of m

Much location detection uses WiFi mac addresses sucked up by stuff like street view cars. Uses much less power. Google have an API to look up a set (min 4) of mac addresses and tell you where you are. I built a tracker with an esp and two AA batteries. Worked like a dream.