Ye Ole Survey Monuments (YOSM for short) (GC45CC) was a travelling geocache that is owned by outforthehunt. The cache moved around the country and you could be looking for a specific survey monument, pillar, surface block, rivet or bolt. The cache was archived by Groundspeak in 2017. At the time, it had 25076 finds by 3528 cachers. This adventure takes you to the 10 most visited YOSM locations in Great Britain. NOTE : This adventure cache will be an adventure. If you complete all of the stages in person, then you will have travelled the length and breadth of Great Britain. Good Luck.
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