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Walk off lunch or enlarge carbon footprint? Ask the GPS.

Putting a green spin on personal navigation, Navitime of Japan today released a new version of its pedestrian GPS software that spells out the health and environmental impact of getting from point A to point B.

Searching for a route on a phone, laptop or other mobile gadget triggers travel options including directions for walking, driving and public transportation. For the walking parts, the program estimates calories burned. For car trips, it guesses at carbon dioxide emissions.

The application for U.S. users is available for download and is a free trial until Sept. 30. After that, you’ll have to subscribe to learn how your errands affect your waistline and the climate.

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