No major advances in mobile location technology have emerged. In the last couple of months, however, quite a few very different approaches to location tracking have emerged. These range from leveraging the earth's magnetic field to piggybacking the data already used by mobile ads, tracking a combination of Wi-Fi and Bluetooth signals, and riding the audio signals from existing music speakers.

But none of these approaches, thus far, has proven effective at delivering truly precise locations.

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Keywords: retail supply chain, monitoring retail consumers' behavior, tracking consumers' buying patterns