Google Latitude is a feature of Google Maps for mobile on these phones:
Android-powered devices, such as the T-Mobile G1
iPhone and iPod touch devices
most color BlackBerry devices
most Windows Mobile 5.0+ devices
most Symbian S60 devices (Nokia smartphones)
Check your friends movments and if they closer enogh get an alert. foloow them stalk them .
Get alerted when your Latitude friends are nearby. Alerts only trigger when:
Store your past locations and visualize them on Google Maps and Earth
See a dashboard showing interesting information, such as trips, frequently visited locations, distance traveled, and more.
Enable Latitude Alerts to get notifications when friends are nearby. Location History allows alerts to only trigger when you are in an unusual place, filtering out routine alerts.