With Google Latitude, you can share your location with friends and family and view their locations on a map. It's a feature of the Google Maps for Android.Here is a step by step on how to activate and set up Google Latitude on Nexus 7 tablet.
* Touch the Google Maps app, and go to the Map view.
* Touch the Menu and select "Join Latitude".
* Add somebody from your Google Contacts or email address. In privacy settings, change your location to automatically and enable check-in notifications.