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How to keep track of friends and family on Android
Use Google Maps on an Android phone to locate your friends and family.
Your first decision is how long to share your location: use the+(plus) or-(minus) buttons to set a time period between 15 minutes and nine hours. You’ll also get an information card telling you how far away they are from you, when their location was last updated, and the battery level of their phone (which might be the reason they’re ignoring your calls). It can even warn you if it thinks a family member has been involved in an accident using phone sensors in the same way as Google’s Personal Safety app.
Or read this on The Verge