Portable GPS locators are being used for art. One “technique involves holding a G.P.S. device, which records their path as a kind of line drawing, and then posting the results on the Web (www.gpsdrawing.com).” The artists travels in a shape as his progress is tracked by the GPS unit. “As G.P.S. receivers have become smaller and cheaper, a growing number of digital artists are exploiting the technology. Like much digital art, the ideas are often spiffier than the visuals.”