The geocaching world is rich with it's own language, terminology and acronyms. When starting out with this game there is quite a steep learning curve to understand the way other players talk and write about the caches they place and hide. However; it doesn't take too long for the lingo to stick and you will soon be at GZ with your GPSR looking at the BOT hoping that you don't DNF the nano!
Ammunition boxes or ammo cans are containers originally designed for safe transport and storage of ammunition. Ammo cans are popular containers for regular or large geocaches. (Info from Geocaching.com)
This walking trail is a mix of (mainly) hard packed surfaces and small sections of sandy track.