Ever wish you could find directions to the nearest bookstore or coffee shop without asking a stranger? Maybe you're having trouble keeping tabs on your adventurous children? Your cell phone could be the answer to such problems, as wireless companies have started to make commercial use of technologies originally developed to help emergency workers find callers in danger. While relatively new, these mobile services have begun to build a following by making it easier for people to find their way around a strange city, meet up with friends, or get directions to a new restaurant or shop.

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