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Explorer 133 Challenge Mystery Cache

Hidden : 11/11/2011
4 out of 5
2 out of 5

Size: Size:   regular (regular)

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Geocache Description:

With the number of different challenge type caches being set we wanted to create something a little different.

To complete this challenge all you have to do is find a total of 133 different caches; how difficult can that be?

The cache is not at the published location which is the centre point of the playing area for this challenge.

What is the Explorer 133 Challenge?

The cache is called the Explorer 133 Challenge because each of the 133 different caches you need to have found to qualify must be in a different British Ordnance Survey grid square as depicted on the Explorer 133 Haslemere & Petersfield map.
The caches can be of any type, previous finds qualify (including those finds now archived and events attended (even if you were the host)), in fact just about any cache other than those you have placed yourself (more on that later) can be counted.
To find out more about this and other Explorer Challenge caches, go to which has been created to complement the cache series.

The grids on the map "start" in the north west corner near Alton at SU 70000 40000

and "finish" to the south east of Petworth at SU 00000 20000, so giving a possible twenty (20 to 39) northing squares and thirty (70 to 99) easting squares. 600 squares in total in which you need to find a cache in 133 different squares to qualify, which in turn equates to less than 25% of the possible squares available.

For those of you that think this challenge is a little too simple, watch out in the not too distant future for Explorer 133 Challenge: Saturation Point, where placing a cache in a square will allow you to count that square toward the full 600 required to complete that challenge.

Those with a particular addiction to Geocaching challenges can opt for the Explorer 133: Super Mario Challenge which requires all 133 to be found in one trip ... at night

From personal experience I know how time consuming trying to determine which of 600 squares of an OS map a cache qualifies for, although of course the British Grid reference is given at the top of each cache page just below the main co-ordinates shown in bold, as circled below.

For the purposes of this challenge the published co-ordinates of all caches, including Unknown/Mystery and Multi caches are those that are to be used when determining which square a cache counts towards

To help those of you that want to plan your finds a GSAK Macro has been written which produces a web page of your finds, example output shown below. I hope to expand the GSAK Macro in the future to show caches that you have not found in the appropriate squares and include links to a well known street mapping website to show map tiles of areas you need to find a cache in.

When you have found the 133 caches you need to provide proof of that fact to be eligible to claim a find on the cache; this can be via one of any number of different methods you may have available:

  1. List the 133 cache codes and names in corresponding grid reference order in your found log
  2. Create a public bookmark list
  3. Send the GSAK Macro generated file to us via our profile or add it to your profile page
  4. Send us your "My Finds" Pocket Query and we will run the GSAK Macro for you and let you know if you qualify and if not which squares you still need to find a cache in to qualify
Any finds without proof of qualification will of course be deleted! Have fun! the cachers in the table below have (those in grey have not found the cache as yet but qualify).

If you want a more up to date score reflected, contact us via our profile and we will update the table.

Additional Hints (Decrypt)

Gb gur yrsg bs gur snyyra gerr gung unf orra pnhtug ol gur L funcrq gerr, va gur haqretebjgu / ubyyl ol gur oneorq jver srapr

Decryption Key


(letter above equals below, and vice versa)