The F Trail, part of the Winter Grooming Snowmobile system for over-snow vehicle (OSV)/snowmobile use, is a heavily used OSV trail accessed from the C Trail at the Southern California Edison plant on Hwy 203 (between the Mammoth Scenic Loop and Main Lodge) that runs up to Minaret Vista. Groomed and marked with orange diamonds, the trail climbs west, parallel to the highway to pass behind Mammoth Mountain Inn. From here up the trail runs along the roadway and is very popular with cross-country skiers. Watch for downhill skier traffic and please respect all trail users. From the summit, the view of the Minarets and Ritter Range is one of the most iconic vistas in the American West. The Winter Grooming Snowmobile System is groomed by the U.S. Forest Service with funding provided by the California Department of Parks and Recreation, using monies generated by registration fees and gasoline taxes.