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YOSM #1063 Mardy Mystery Cache

Hidden : 10/09/2021
2 out of 5
2 out of 5

Size: Size:   micro (micro)

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How Geocaching Works

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Geocache Description:

You are looking for a film pot. 

To get the coordinates for where this geocache is hidden you need to visit the five stages of the Cardiff foreshore Ad Lab, one of which visits the trig point, and gather the numbers that are revaled on completion of each stage.  The numbers can then be fed into the following equation:













About Ye Ole Survey Monuments

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 (Decrypt)

Uvag va n Nq Yno pbzcyrgvba zrffntr

Decryption Key


(letter above equals below, and vice versa)