Two weeks ago, Google launched Google Latitude - a new function for its Google Maps for Mobile app that allows users to share their location with friends and family. We've found out everything you need to know about the service and how to use it.

Google Latitude is a real-time tool that's opened up the world of location-based services for both PC and mobile phone users.

But controversy goes hand-in-hand with any tool that allows you to track other people's whereabouts, and it wasn't long before privacy campaigners slammed the new service. Whether the tool is a good thing remains to be seen, after all it could create a corporate '1984' world in which your boss can track your every move.

While we're not addressing the privacy issue, we have answered all our burning questions about the service and how to use it.

Can I use Google Latitude?

According to Google, if you have any mobile device that supports Google Maps for Mobile v3.0 and above, you're probably good to go. Those include Android-powered devices with Maps v3.0 and above; most colour BlackBerry devices; most Windows Mobile 5.0 and above devices; and most Symbian S60 devices.

In the near future, you'll also be able to use Latitude on the iPhone and iPod Touch with the Google Mobile App in the US, and on many Sony Ericsson devices. In addition, you can use Latitude today on a Linux, Mac or Windows PC by using the Latitude iGoogle gadget (you'll need a Google Account) and iGoogle, Google's personalised web portal.

How do I get it?

Mobile users need to first have Google Maps 3.0 or above installed. After that, you can install Latitude. PC users can install the gadget by starting from the Google Latitude site.

I don't have a GPS chip in my phone. Can I still use Latitude?

You betcha. Latitude can use Wi-Fi access points, mobile towers or GPS to work out your location.

How does Latitude do that?

Google is using technology that's a software-only location solution, which allows any mobile device with Wi-Fi, GPS or a cellular radio to determine its position with an accuracy of 10 to 20 metres. What sets it apart is that it uses land-based Wi-Fi access points, GPS satellites and cellular towers to determine location information.

In other words, Latitude can use any of the three kinds of signals - Wi-Fi, 2G/3G/4G mobile or GPS satellite - that a device can pick up to work out its location. By leveraging these wireless capabilities, the software can combine positioning data from satellites, carrier assistance servers and Wi-Fi base stations to significantly speed up positioning, or time to first fix (TTFF). TTFF for some devices can be up to a minute, but by using multiple reference sites, Latitude can reduce TTFF to a few seconds.

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