GPS: Not a City Kitty

9:40 AM -- With mobile operators and their virtual friends talking up the tracking capabilities now available over mobile phones, we'd do well to remember that GPS does have some blind spots. (See Location Services Lost on Users.)

Specifically, GPS doesn't work that well indoors or in built-up areas. If the three satellites needed to triangulate GPS positions cannot "see" the receiver, then errors are likely -- even when the receiver is aided by additional data from the cellular network.

This might not matter so much when you are using GPS to trace a truckload of indigestion tablets through the ring roads of Boston, but it's worth keeping in mind when location-capable handsets are being sold to anxious parents as potential child-tracking devices.

— Dan Jones, Site Editor, Unstrung

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