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International travelers can use the Global Positioning System and technological assistance from smart-road programs. Meanwhile, NASA is paving the way for direction-finding by travelers on other planets.

The government can't yet help people get to Mars, but those who can find their own way can use NASA maps and photos to get around once they land.

Check ic-www.arc.nasa.gov/ic/projects/bayes-group/Atlas/Mars to review the first online atlas of Mars, which holds images from the Viking Orbiter spacecraft. To see images from the surface of Mars, go to nssdc.gsfc.nasa.gov/planetary/viking.html.

The National Space Science Data Center at NASA's Goddard Space Flight Center in Greenbelt, Md., maintains the data

Mars too crowded for you? Check maps for Venus, the Moon and Jupiter's satellites Callisto, Europa and Ganymede at pdsmaps.wr.usgs.gov/maps.html. NASA's Office of Space Science maintains thes images on the Planetary Data System.

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