By now, if you've been up to the Bivvy and back and saved this side track for on the way back, you may be a bit tired and seeing things in the trees. Here you will find a stone cairn covering something. Glance up in the trees for other clues. Inside you find a compass direction contained in the passage. Head this way for about 9 metres to find the final, similar location.
Cyrnfr ercynpr gur ebpxf nf gurl jrer, gb pbire gur pbagnvare.