A new service on Google maps, called Latitude, allows cellphone users check their location, as well as track their friends whereabouts. The software, which can also be installed on a laptop or PC, plots a user's location-marked by a personal picture on the map-by relying on cellphone towers, GPS or a Wi-Fi connection. As for privacy concerns, lattitude - fuctional in India- lets user decide who can monitor his location, and in how much detail.