It’s a scenario familiar to any skier or snowboarder: You pull out your trusty paper trail map on a snowy, windy day, only to have it flap around, rip into pieces and succumb to the soggy bounds of your gloves. Now, though, you may be able to spare yourself the struggle. The map mavens at Google this week rolled out their latest product, mobile trail maps of 38 resorts in the U.S. and Canada, complete with colored lines for trails — green for beginner runs, blue for intermediate and black for experts — along with lifts and the occasional Street View–like tour.