About half a million users are embracing crowdsourced versions of digital maps . OpenStreetMap provides maps that can be customized and mapped to GPS devices . `` It 's really hard to mess up your GPS doing this , '' says Owings . Crowdsourced maps can show hiking trails , river rapids and other features . Developers are creating iPhone apps based on these maps .
About half a million users are embracing crowdsourced versions of digital maps . OpenStreetMap provides maps that can be customized and mapped to GPS devices . Crowdsourced maps can show hiking trails , river rapids and other features . Developers are creating iPhone apps based on these maps .