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YOSM #0987 Carn Marth Letterbox Hybrid

Hidden : 04/05/2024
2 out of 5
2.5 out of 5

Size: Size:   small (small)

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Geocache Description:

Another cache to mark the relaunch of Ye Olde Survey Monuments (YOSM) Series. On a clear day you can see for miles - honest! This is a great area for walking, cycling or riding and is very popular with dog walkers, but can get very wet. There are also lots of other caches nearby, so why not bag a few more while you are here wink.

I have not specified a parking area or trailhead as there are numerous ways to get to the trig pillar

BUT, the cache is NOT at the given co-ordinates!

To find the cache:

Simply complete the jigidi and then follow the completion message to finally locate the cache


You can validate your puzzle solution with certitude.


You will be looking for a small clip box  with a simple letterbox stamp - please do NOT remove the stamp

Ye Ole Survey Monument (YOSM) is a captivating series of caches that pays homage to the remarkable legacy of OutForTheHunt's YSM series (GC45CC).

YOSM caches are strategically positioned at or near Trig Points. These triangulation stations have played a pivotal role as surveying landmarks, contributing to the mapping of expansive territories. Some of these points, bearing historical significance, might now be situated on private land or have vanished with time. As a result, the caches are artfully placed in close proximity, reverently acknowledging the historical importance of these survey monuments.

More information, bookmarks and statistics can be found at the YOSM Website

If anybody would like to expand the Ye Ole Survey Monuments Series, please do. I would ask that you request a number for your cache first at so we can keep track of the numbers and names to avoid duplication.

Additional Hints (No hints available.)