http://hexus.net/mobile/news/general...ation-sharing/

Google has announced that it will be improving the Google Maps app by enabling real-time location sharing. The company is rolling out new apps for Android and iOS which will allow users to temporarily share their locations with friends, family, or colleagues - anyone in their Google contacts. Those who are invited to view your location can monitor your location and track your ETA in their own mobile app, or in Google Maps via a web browser.