Guest Post: A Muggle's Guide to EarthCaching | The Geocaching Junkie

International EarthCache Day is 9th October this year. If you’re having trouble convincing your muggle family or friends to go with you to find an EarthCache and earn a souvenir for your profile, Andy Wright (tentmantent) has kindly shared this article he wrote in 2013, explaining what EarthCaching is for non-geocachers! 

Many of you will have heard of the 21st century outdoor ‘sport’ of Geocaching. Often described as a high-tech treasure hunt, it involves using GPS technology such as a hand held receiver or smart-phone to find a ‘cache’, often a tupperware box or a film pot, hidden by another player at specific location. “Caching” is a fast-growing activity popular with all ages from young families to retired couples.


Caches come in many different sizes and types. There are micro and nano-sized caches, puzzle caches, challenge caches, mystery caches and even extreme caches for the more adventurous. But how many of you have heard of Earthcaching? Earthcaches do not involve physical containers but rather require the cacher to answer questions about an aspect of earth science at a specific location. To claim the ‘find’, a geocacher first must navigate to the designated feature such as a disused quarry, gravel pit or hillside and then find the answers to a few related questions. Although some questions may be simple enough to answer using Google, all published Earthcaches will involve answering some questions or undertaking tasks that can only be completed by actually visiting the site. Some caches involve posting a photo taken at the location to prove that the site was actually visited!


Time for an example: I have ‘placed’ an Earthcache at Lincoln Cathedral which requires the cacher to examine very closely the oolitic limestone from which it is built. The tasks that I have set include giving a description of the ooliths within the stone, their size, shape and colour, the number per square cm and give the type and name of the stone itself. Having done this the cacher then must email me the “cache owner” their answers. If I am satisfied that their responses are reasonably accurate, I will then respond, giving them permission to log their find on, the main website for geocaching and the only one on which Earthcaches can be listed.

A Muggle's Guide to EarthCaching by Andy Wright (tentmantent)
Lincoln Cathedral, photgraphed by Richard Croft

Groundspeak, the Seattle-based company that owns and runs has a highly efficient network of volunteers known as reviewers, who check each submitted cache listing before it is published online, allowing other cachers to download the coordinates and so find the cache. In the case of Earthcaches, this task is undertaken by the US Geological Society, in partnership with Groundspeak. An Earthcache reviewer must ensure that the cache listing includes an Earth science lesson that relates to the given location; that the coordinates are accurate and do not take players onto private property; that the tasks are varied, challenging and can largely only be completed by visiting the site itself.

Groundspeak long ago abandoned the publication of so-called virtual caches (ones with no physical container to find, just a task to perform at the given location), arguing that these were not in the original treasure-hunting spirit of geocaching. However, Earthcaches survived, thanks in part to the fact that most of the reviewing and other associated admininstration is undertaken by the USGS which sees it as a key tool in its educational outreach work.

Cliffs of Moher2 (1 of 1)

Earthcaching, like all geocaching, can take players to locations that they otherwise might never have heard of. It can also allow cachers to find places and features that do not feature in any guidebook, map or leaflet. This is, in fact, true of all aspects of geocaching, but in Earthcaching we have a unique, location-based game with which to promote the excitement and mystery that we all find in geology and other aspects of Earth science.

Adapted from an article originally published in Rockhopper, the newsletter of the East Midlands branch of the Open University Geological Society in November 2013 and printed here with kind permission of the author.


About the Author:

Andy/Tentmantent has been caching for over ten years and loves every aspect of the game. He is based in Lincoln in the UK and has developed EarthCaches on three continents.

Leave a Reply