Google Latitude: Friend Finding Maps on Smartphones and PCs

Google's released Latitude, a Maps tool that allows for automatic tracking of friends in real time, using a laptop, Symbian 60, Blackberry, WinMo and soon, iPhone or Android.

Laptops and cellphones (when not using GPS) can locate to a fair level of accuracy using geotagged Wi-Fi and cellular tower points in a database that Google's collected on its own, perhaps while doing Streetview photography. Or you can set your location manually. Google told me that there's no set standard for how often the map updates your location. Rather, they have an algorithm that depends on how often the device has moved, historically, and how much battery your device has left. You can also sign out of the service entirely, and set per user preferences on whether or not certain friends can see your location at all, or if only on city-levels of accuracy.

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