Tracman lets you see your GPS location on a map. You can send a link to this map to friends or family to let them track your precise location. No need for them to download anything: the map renders beautifully in any browser.
* Realtime updates with websockets
* Saves battery when nobody's viewing the map
* Turn off updates to go undercover
Find out more at https://tracman.org/
Tracman is open-source: https://github.com/Tracman-org/Android