Logbooks for caches hidden out in the world.
Each cache has its own code. Scan it when you find the cache and you can sign that cache's log: the date, a short note, and a photo if you like.
There is no list of caches here. You find them by looking.
Found one?
- Scan the code inside or on the cache with your phone's camera.
- Add the date and a few words. A name is optional; a trail name works fine.
- Put the cache back exactly as you found it, for the next person.