Track the exact location of friends and family
Find My Friends is a clever geolocation app which allows you to pinpoint the location of friends or family on your mobile.
You need an iCloud Apple ID to sign in but then you just select the contacts or email addresses of the people you want to track. Your target will however need Find My Friends installed on their device and has to accept the invite via the app.
There are obvious privacy implications with Find My Friends, although you can use temporary sharing for a specific time period.