Mates

The mates list is one of the spookiest features of Geocaching Australia.

"How does the system know who my friends are?!?!"

Actually, it's quite simple: It's based on the number of simultaneous finds of caches by pairs of cachers. For example, if you and someone else regularly log the same caches on the same day, it assumes you are caching together and further assumes you are mates.

Despite the multi-level assumptions, it's often quite accurate!