Chirp caches are required to be unknowns unless you provide an alternative method of getting to the final. In the knowledge books.
That's how Birds of Armand Bayou got to be a multi -- I had a multi tag at the first spot. So you could get the chirp from your yak or you could get out and find the multi tag -- but had to get out.
Edited by cachestacker, 31 October 2013 - 08:54 AM.