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Explorer 160 Challenge

A cache by colincactus Send Message to Owner Message this owner
Hidden : 11/18/2014
4 out of 5
1.5 out of 5

Size: Size: small (small)

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Geocache Description:

This cache is another in the Explorer Challenge series, originally conceived by PetersfieldPoodlePosse, and based upon British Ordnance Survey grid squares as depicted on Explorer maps.

To complete the challenge you need to find (or have found) a total of 160 different caches. I expect a fair number of you will already qualify - so who will be the first to the cache?

What is the Explorer 160 Challenge?

The cache is called the Explorer 160 Challenge because each of the 160 different caches you need to have found to qualify must be in a different British Ordnance Survey grid square as depicted on the Explorer 160 Windsor, Weybridge & Bracknell 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 can be counted.

The south west corner of this map is near Yateley at SU 80000 60000

and the north east corner is near Hayes at TQ 10000 80000. That gives a possible twenty squares (South to North) by thirty squares (East to West) equalling 600 squares in total, of which you need to find a cache in 160 different squares to qualify.

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.

So how do I know which of the 600 grid squares on the OS map my cache find is in?

Well, the British OS Grid reference is given at the top of each cache page just below the main co-ordinates, as circled in red below. Or if you click on the link in the "For online maps..." section of the cache page, this will show the location of the cache in its grid square on an OS map.

For those of you that want automated help to plan (or prove) your finds a GSAK Macro has been written which produces a web page of your finds and any unfound caches in your current GSAK database. The macro is called 'ExplorerChallenges', ensure you have the latest version. See the macro help page for full instructions.

Here's an example of running the macro:

When you have found the 160 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 160 cache codes and names and the corresponding grid reference in your found log.
  2. Create a public bookmark list
  3. After the GSAK macro has run and displayed its output in your browser window, save the web page (as an .html file) and email it to me.
  4. Attach the GSAK macro generated image to your log, add it to your profile, or your personal webpage.
  5. Create a Spreadsheet grid of your finds and attach an image of it to your log.
  6. Use the challenge checker from Project-GC and attach the results to your log.

Any finds without proof of qualification will of course be deleted! Have fun!

Position Name Squares filled
1st SomersetCache 412
2nd Number six 377
3rd Dumpster41 350
4th Woking Wonders 341
5th Amberel 335
6th qrang 332
7th AmayaTom 275
8th twinkandco 265
9th EL-JO 231
10th= IceColdUK, dyedwestie 224
12th ReggieCat 211
13th DizzyPair 183
14th BaSHful 182
15th bleachedwestie 180
16th TurnerTribe 177
17th= Frycrt17, Malpas Wanderer 175
19th Lydford Locators 173
20th Colincactus 167
21st TrainSPLOTer 165
22nd Bellabumpkin 164
23rd Mellers 162

Oh and here's a link to how many I've found at the moment.

Additional Hints (Decrypt)

Onfr bs n ynetr gevcyr-gehaxrq fvyire ovepu haqre fgvpxbsyntr. Cyrnfr rafher gur pnpur vf jryy uvqqra.

Decryption Key


(letter above equals below, and vice versa)



51 Logged Visits

Found it 23     Didn't find it 1     Write note 25     Publish Listing 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 31 images

**Warning! Spoilers may be included in the descriptions or links.

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Rendered From:Unknown
Coordinates are in the WGS84 datum

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