DeLorme, an atlas company and leader in computer mapping, provides one of the most extensive U.S. mapping systems on the Web.

CNN: Site-Seer: Web site maps make navigating easy

Some of his success is down to computer mapping of where crimes are taking place, as well as a team of 40 street wardens, Mr Mallon has suggested.

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This allows the log to be read by a laptop computer and displayed as a journey on Google Earth, the software giant's popular world-mapping software.

ECONOMIST: Monitor