1.   Because deep snow can conceal the unmarked trails, the Park Service says that map and compass skills are essential.

2.   Best of all, the SORBA site includes route maps of several different North Georgia rides that take some of the guesswork out of finding otherwise unmarked trails.

3.   The two were on an unmarked trail, taking them deeper into the pathless woods on the back side of Killington Peak.

4.   They track unmarked trails and update printouts from Toposcout CD-ROMs that contain all of the United States Geological Survey topographic maps for their particular state.

5.   Year-round, backcountry skiers reap the benefit of the serenity and rigorous exercise that comes with challenging unmarked trails.