There are many applications for indoor location determination, from personal navigation to firefighting and disaster response. GPS signals are too weak for indoor use, however, and the problem of developing a reliable indoor navigation system remains unsolved. Wi-Fi fingerprinting is a promising new technique. Animals such as sea turtles and spiny lobsters use the earth's magnetic field for navigation with a fingerprinting approach that is similar to Wi-Fi fingerprinting. In this paper, we investigate the possibility of supplementing Wi-Fi fingerprinting with geomagnetic fingerprinting. Our results show that although the earth's magnetic field is not sufficient on its own to determine location, it improves the accuracy of Wi-Fi fingerprinting.
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