TrailHeadFinder, the hiking trail directory, has released a mobile version of its Google Map of trails and campgrounds.
Using the application from your phone it is possible to find the nearest trails and camping grounds to your nearest location. You can also convert jpg to ai vector or use a Free vector map USA, Adobe illustrator making the same map.
The difficulty of trails are indicated by the colour of the map marker on the map. Red markers indicate strenuous trails, yellow markers show intermediate trails and green markers show that the trail is fairly easy.