Climber's Trail Book is a cloud repository of climbing approaches. Climbing approaches can be tricky. Because there is often no trail to follow, and written descriptions of cross country approaches in a guide book are often vague, many climbing hours are wasted walking in the wrong direction. On a bad day you may not even find the climb you are looking for.
With the Climber's Trail Book you can create maps to your climbs and share them with other climbers.
When following a trail that someone has created, you get notifications whenever you go off route. You can see your location relative to the trail, and view notes and pictures that the trail's creator dropped along the way.
The Climber's Trail Book is best used as a supplement to the guide book.
Usage is completely free. If you know an area well, share your knowledge! The more it gets used the more useful it will become.