An ammo can on the quarry floor.
A popular spot for barbeques! After finding this one head towards the Ham Wood Viaduct cache. There are a few ways to get up to this one. The easiest route is the FP that loops out and back. Many climb straight up as you can see.
Qbja fybcr. YUF . Nobhg 8 lneqf sebz cngu haqre fgbar