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Explorer 288 Challenge

A cache by Flash and Grubbly Send Message to Owner Message this owner
Hidden : 4/21/2014
4.5 out of 5
1.5 out of 5

Size: Size: regular (regular)

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Geocache Description:

This is the thirty-fourth cache within the Explorer Challenge series based on British Ordnance Survey grid squares as depicted on Explorer maps, originally conceived by PetersfieldPoodlePosse The other caches in this series are on this list.

The cache IS at the published location, which is close to the centre point of the playing area for this challenge.

To complete the challenge you need to find (or have found) a total of 288 different caches. We expect a number of you will already qualify - but how far up the league table will you get?

What is the Explorer 288 Challenge?

Explorer 288 Cover

The cache is called the Explorer 288 Challenge because each of the 288 different caches you need to have found to qualify must be in a different British Ordnance Survey 1 kilometre grid square as depicted on the Explorer 288 Bradford & Huddersfield (East Calderdale) 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.

To find out more about this and other Explorer Challenge caches, go to which has been created to complement the cache series.

North West Squares The grids on the map "start" in the north west corner along the Aire Valley Road at SE 08000 42000...
...and "finish" in the south east near Hoylandswaine at SE 28000 04000 giving a possible thirty-nine squares (South to North) by twenty-one squares (East to West) equalling maximum possible 819 squares out of which you need to find a cache in 288 of them to qualify, a total of 35.2%.

We know that some of you concern yourself with whether cache owners qualify for their own challenges so rest assured that we do, with 323 qualifying squares (as of 22nd August 2018, shown a little further below - we had 289 at the time of publishing).

South East Squares

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 819 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 on one of our caches. In the example below, the Grid reference is SE 18540 26779. This is the location to the nearest metre, so the 1 kilometre OS Grid square which it is located in will be SE 18 26.

It is also possible to view the location of a cache in its grid square on an OS map by scrolling down the the "For online maps..." section of the cache page and clicking the link (as shown below).

For those of you that want automated help to plan (or prove) your finds, a GSAK macro for the various Explorer Challenges can be downloaded from here which produces a web page of your finds as well as any unfound caches in your current GSAK database selection that count toward this cache.

Here is ours showing our qualifying caches (323 as of 22nd August 2018)

When you have found the 288 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 288 cache codes and names and the corresponding grid reference in your found log. e.g.
    GC3GWAY Bents tree SE 08000 37000
    GC4XGNG Marleys View SE 08000 36000;
  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 a .html file) and email it to us (flashandgrubbly [at], replacing [at] with @);
  4. Attach a screen shot of the GSAK macro generated image to your log, add it to your profile, or email it to us.
  5. 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;
  6. Create a Spreadsheet grid of your finds and attach an image of it to your log.

Please include your geocaching name in any email!

The GSAK route is probably the easiest. If you're not familiar with GSAK and/or macros, BaSHful has very useful help page based around the Explorer 146 Challenge.

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

League table of squares filled by finders shown below:
Last updated on Friday, 1st Deptember 2017.

Position Cacher Squares Filled Percentage Filled Date Logged
1 MikeG 732 89.38% 25/08/2017
2 overanout 712 86.94% 14/03/2015
3 HxRoamer 710 86.69% 22/04/2014
4 Astra-nomical 656 80.10% 14/03/2015
5 windswept 649 79.24% 27/07/2014
6 Peter & Di 616 75.21% 01/08/2015
7 nottins - FTF 610 74.48% 22/04/2014
8 Aldocandy 603 73.63% 06/09/2015
9 tezz03 582 71.06% 26/06/2017
10 TheBradfordRambler 541 66.06% 13/05/2014
11 B:W:R 517 63.13% 31/05/2015
12 Applepye 505 61.66% 31/05/2015
13 Berticusdan 496 60.56% Not yet
14 Explorer Scout 480 58.61% 01/10/2016 (No grid provided)
15 Jurassic Parkinsons 457 55.80% 24/05/2014
16 team mx 447 54.58% 27/06/2016
17 Mel&Freddie17 433 52.87% 05/04/2015
18 RandomGoat 428 52.26% 22/04/2014
19 Leeds Tyke 427 52.14% 27/03/2015
20 mallykay 406 49.57% 14/03/2015
21 Hulleteers 381 46.52% Not yet
22 Cheekybev 369 45.05% 07/04/2015
23 The Hecky Thumpers 351 42.86% 29/04/2014
24 rubywalkers 348 42.49% 17/09/2015
25 Clan-Wallace 346 42.25% 22/11/2016
26 hunkyhamster 345 42.12% 27/05/2014
27 RM73 337 41.15% 29/02/2016
28 TwoMcGhees 329 40.17% 23/04/2014
29 simwil 328 40.05% 09/06/2016
30 Flash and Grubbly - owners 323 39.44% ---
31 supertrampz 322 39.32% 03/05/2014
32 CRPK 308 37.61% Not yet
33 S Bear 294 35.90% 15/10/2015
34 desertfoxuk 291 35.53% 20/04/2015
35 Fred the Red 290 35.41% Not yet
36 richlay 288 35.16% 26/06/2014
--- sillyb ??? --.--% 05/05/2014 (No grid provided)
--- stevejwalford ??? --.--% 29/06/2017 (No grid provided)

Many thanks to PetersfieldPoodlePosse for producing the GSAK Macro.

Once you have completed the challenge and signed the log, you may display this souvenir on your profile.

Copy this text into your profile page

<a href=""><img src="" /></a>

Additional Hints (Decrypt)

Haqre zbff pbirerq fgbarf

Decryption Key


(letter above equals below, and vice versa)



71 Logged Visits

Found it 38     Write note 32     Publish Listing 1     

View Logbook | View the Image Gallery of 38 images

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

Current Time:
Last Updated:
Rendered From:Unknown
Coordinates are in the WGS84 datum

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Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.