Difference between revisions of "Hash collision achievement"

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==Reverse collision==
 
==Reverse collision==
There is now a geocache listing, [http://coord.info/GC4JCB6 GC4JCB6], which reverses the challenge. In order for a geocacher to complete the challenge (akin to earning the ribbon) and be able to log the cache as found, the geocacher must find a geocache that is within 1km of a geohash location. It follows that any geohasher that has already earned the Collision Achievement has already completed this geocaching challenge. But rather than introduce geocaching to the geohashing community, this cache serves to introduce geocachers to the concepts of geohashing. Of course, to claim this geocache as found, one would also need to physically visit the geocache, which is located in Southern New Mexico, and it is unlikely that a herd of Geohashers will descend on the state to do so. There are other geocache listings that introduce the concepts of geohashing as well.
+
There is now a geocache listing, [http://coord.info/GC4JCB6 GC4JCB6], which reverses the challenge. In order for a geocacher to complete the challenge (akin to earning the ribbon) and be able to log the cache as found, the geocacher must find a geocache that is within 1km of a geohash location. It follows that any geohasher that has already earned the Collision Achievement has already completed this geocaching challenge. But rather than introduce geocaching to the geohashing community, this cache serves to introduce geocachers to the concepts of geohashing. Of course, to claim this geocache as found, one would also need to physically visit the geocache, which is located in Southern [[New Mexico]], and it is unlikely that a herd of Geohashers will descend on the state to do so. There are other geocache listings that introduce the concepts of geohashing as well.
  
You will find another reversed challenge at [http://www.opencaching.de www.opencaching.de]: The geocache [http://www.opencaching.de/viewcache.php?wp=OCF495 OCF495] in Berlin/Germany.  
+
You will find another reversed challenge (Safari Cache) at [http://www.opencaching.de www.opencaching.de]: The geocache [http://www.opencaching.de/viewcache.php?wp=OCF495 OCF495] in Berlin/Germany. This cache can be loged as son as you visit your first geohash. There is no need to travel to Berlin.
  
 
==Winners==
 
==Winners==
Line 30: Line 30:
 
*[[2013-08-07 32 -117]] ([[San Diego, California|San Diego, California]]): [[User:Mathgeek|Mathgeek]] discovered the [http://coord.info/GC48BZK GC48BZK] geocache just about 173 ft. from the hashpoint.
 
*[[2013-08-07 32 -117]] ([[San Diego, California|San Diego, California]]): [[User:Mathgeek|Mathgeek]] discovered the [http://coord.info/GC48BZK GC48BZK] geocache just about 173 ft. from the hashpoint.
 
*[[2013-10-09 51 5]] ([[Eindhoven, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC4FR3F GC4FR3f] geocache at 270 meters from the hash with a clear line of sight from hash to cache
 
*[[2013-10-09 51 5]] ([[Eindhoven, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC4FR3F GC4FR3f] geocache at 270 meters from the hash with a clear line of sight from hash to cache
*[[2017-02-12 48 2]] ([[Paris, France]]): [[User:Dunaril|Dunaril]] crossed the square and paid a visit to the [http://coord.info/GC24HV4 GC24HV4] geocache he had logged about 3 years earlier!
+
*[[2017-04-09 48 9]] ([[Stuttgart, Germany]]): [[User:Drei aus Korb|Drei aus Korb]] found the [https://coord.info/GC25642 GC25642] geocache at about 7 metres from the hash on 11.09.2016
 +
*[[2017-04-12 48 2]] ([[Paris, France]]): [[User:Dunaril|Dunaril]] crossed the square and paid a visit to the [http://coord.info/GC24HV4 GC24HV4] geocache he had logged about 3 years earlier!
 +
*[[2018-09-23 51 9]] ([[Kassel, Germany]]): [[User:Digiphono|Digiphono]] solved a letterbox/mystery and found the final of [http://coord.info/GC7VACR GC7VACR] to be at less than 10 meters from the hash
 +
*[[2018-09-28 52 9]] ([[Hannover, Germany]]): [[User:Fippe|Fippe]] found the [https://coord.info/GC4EHDT GC4EHDT] Geocache 265 meters near the Geohash, in line of sight.
 +
*[[2018-11-23 54 13]] ([[Stralsund, Germany]]): [[User:SastRe.O|SastRe.O]] visited the [https://coord.info/GC7HJR8 GC7HJR8] geocache, 27 meters from the Geohash.
 +
*[[2023-08-08 47 8]] ([[Zürich, Switzerland]]): [[User:globescorer|globescorer]] found the [https://coord.info/GC5492F GC5492F] Geocache 393.28 meters near the Geohash, but in line of sight.
 +
*[[2023-10-29 -34 138]] ([[Adelaide North, Australia|Adelaide, Australia]]): [[User:XXOs|XXOs]] found the [https://coord.info/GC2CJWA GC2CJWA] Geocache 90 metres near the Geohash.
  
 
==Honorable Mention==
 
==Honorable Mention==
 
A geocache discovered within one kilometer of the geohash wins you the honorable mention.
 
A geocache discovered within one kilometer of the geohash wins you the honorable mention.
 
 
*[[2008-11-26 48 8]] ([[Pforzheim, Germany]]): [[User:Ekorren|Ekorren]] and [[User:Danatar|Danatar]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=2ef73bd0-e226-4527-a3e4-15c26593ba5c GC14WEH] geocache 0.85 km from the hashpoint.
 
*[[2008-11-26 48 8]] ([[Pforzheim, Germany]]): [[User:Ekorren|Ekorren]] and [[User:Danatar|Danatar]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=2ef73bd0-e226-4527-a3e4-15c26593ba5c GC14WEH] geocache 0.85 km from the hashpoint.
 
 
*[[2009-01-01 36 -75]] ([[Virginia Beach, Virginia]]): [[User:Ncbears|NCBears]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=d833164b-ada5-4f9f-b930-0481470f0f47 GCGF7E] geocache 298 meters from the hashpoint.
 
*[[2009-01-01 36 -75]] ([[Virginia Beach, Virginia]]): [[User:Ncbears|NCBears]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=d833164b-ada5-4f9f-b930-0481470f0f47 GCGF7E] geocache 298 meters from the hashpoint.
 
 
*[[2009-03-28 39 -86]] ([[Indianapolis, Indiana|Bloomington, Indiana]]): [[User:ErWenn|Erik]] and Kira discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=53646f18-32d5-41aa-a0c4-70d557aa85d3 GCQ4ZP] geocache 740 meters from the hashpoint.
 
*[[2009-03-28 39 -86]] ([[Indianapolis, Indiana|Bloomington, Indiana]]): [[User:ErWenn|Erik]] and Kira discovered the [http://www.geocaching.com/seek/cache_details.aspx?guid=53646f18-32d5-41aa-a0c4-70d557aa85d3 GCQ4ZP] geocache 740 meters from the hashpoint.
 
 
*[[2009-08-02 39 -84]] ([[Cincinnati, Ohio]]): [[User:Scottkuma|Scottkuma & family]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?wp=gcx7ad GCX7AD] geocache 414 meters from the hashpoint.
 
*[[2009-08-02 39 -84]] ([[Cincinnati, Ohio]]): [[User:Scottkuma|Scottkuma & family]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?wp=gcx7ad GCX7AD] geocache 414 meters from the hashpoint.
 
 
* And, on the very same day... [[2009-08-02 39 -84]] ([[Cincinnati, Ohio]]): [[User:Scottkuma|Scottkuma & family]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?wp=gcx7ae GCX7AE] geocache 433 meters from the hashpoint.
 
* And, on the very same day... [[2009-08-02 39 -84]] ([[Cincinnati, Ohio]]): [[User:Scottkuma|Scottkuma & family]] discovered the [http://www.geocaching.com/seek/cache_details.aspx?wp=gcx7ae GCX7AE] geocache 433 meters from the hashpoint.
 
 
* [[2009-08-13 52 13]] ([[Berlin, Germany]]): Four find the [http://coord.info/GCY864 GCY864] geocache 116 metres from the hashpoint but unfortunately not in line of sight.
 
* [[2009-08-13 52 13]] ([[Berlin, Germany]]): Four find the [http://coord.info/GCY864 GCY864] geocache 116 metres from the hashpoint but unfortunately not in line of sight.
 
 
* [[2010-10-08 56 13]] ([[Hässleholm, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1K3MW GC1K3MW] geocache 234 metres from the hashpoint, not in line of sight.
 
* [[2010-10-08 56 13]] ([[Hässleholm, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1K3MW GC1K3MW] geocache 234 metres from the hashpoint, not in line of sight.
 
 
* [[2010-10-10 -31 115]] ([[Perth, Australia]]): [[User:Phi-loci-raptor|Phi-loci-raptor]] and [[User:Pyroteknik|Pyroteknik]] are thrwarted by dense bush despite locating [http://www.geocaching.com/seek/cache_details.aspx?wp=GC1YYV4 GC1YYV4] 143m from the hashpoint.
 
* [[2010-10-10 -31 115]] ([[Perth, Australia]]): [[User:Phi-loci-raptor|Phi-loci-raptor]] and [[User:Pyroteknik|Pyroteknik]] are thrwarted by dense bush despite locating [http://www.geocaching.com/seek/cache_details.aspx?wp=GC1YYV4 GC1YYV4] 143m from the hashpoint.
 
 
* [[2010-11-21 49 8]] ([[Mannheim, Germany]]): [[User:Mampfred|Mampfred]] and [[User:QuarterCacher|QuarterCacher]] climbing a tree to find the [http://coord.info/GC14VHJ GC14VHJ]  geocache about 130 meters from the hash.
 
* [[2010-11-21 49 8]] ([[Mannheim, Germany]]): [[User:Mampfred|Mampfred]] and [[User:QuarterCacher|QuarterCacher]] climbing a tree to find the [http://coord.info/GC14VHJ GC14VHJ]  geocache about 130 meters from the hash.
 
 
*[[2010-12-28 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] and [[User:OlofL|OlofL]] found the [http://coord.info/GC1P8ZK GC1P8ZK] geocache 162 metres from the hashpoint and also a opencaching mystery cache [http://www.opencaching.se/viewcache.php?cacheid=198 OS00C6] final solution within clear line of sight.
 
*[[2010-12-28 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] and [[User:OlofL|OlofL]] found the [http://coord.info/GC1P8ZK GC1P8ZK] geocache 162 metres from the hashpoint and also a opencaching mystery cache [http://www.opencaching.se/viewcache.php?cacheid=198 OS00C6] final solution within clear line of sight.
 
 
*[[2011-04-30 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1XV8Z GC1XV8Z] geocache 146 metres from the hashpoint probably within clear line of sight.
 
*[[2011-04-30 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1XV8Z GC1XV8Z] geocache 146 metres from the hashpoint probably within clear line of sight.
 
 
* [[2011-07-04 66 25]] ([[Rovaniemi, Finland]]): [[User:Isopekka|Isopekka]] found the [http://coord.info/GCVWW9 GCVWW9] geocache 596 metres from the hashpoint, not in line of sight.
 
* [[2011-07-04 66 25]] ([[Rovaniemi, Finland]]): [[User:Isopekka|Isopekka]] found the [http://coord.info/GCVWW9 GCVWW9] geocache 596 metres from the hashpoint, not in line of sight.
 
 
* [[2011-08-06 42 -88]] ([[Schaumburg, Illinois]]): [[User:RocketMac|RocketMac]] found the [http://coord.info/GC1JTJN GC1JTJN] geocache 176 meters from the hashpoint, not in line of sight.
 
* [[2011-08-06 42 -88]] ([[Schaumburg, Illinois]]): [[User:RocketMac|RocketMac]] found the [http://coord.info/GC1JTJN GC1JTJN] geocache 176 meters from the hashpoint, not in line of sight.
 
 
* [[2011-09-15 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1JQA0 GC1JQA0] geocache 119 meters from the hashpoint, not in line of sight.
 
* [[2011-09-15 55 13]] ([[Malmö, Sweden]]): [[User:Llavids|Llavids]] found the [http://coord.info/GC1JQA0 GC1JQA0] geocache 119 meters from the hashpoint, not in line of sight.
 
 
* [[2011-12-11 42 -87]] ([[Kenosha, Wisconsin]]): [[User:RocketMac|RocketMac]] found the [http://coord.info/GC349X9 GC349X9] geocache 696 feet from the hashpoint, in line of sight.
 
* [[2011-12-11 42 -87]] ([[Kenosha, Wisconsin]]): [[User:RocketMac|RocketMac]] found the [http://coord.info/GC349X9 GC349X9] geocache 696 feet from the hashpoint, in line of sight.
 
 
* [[2012-03-30 52 5]] ([[Utrecht, Netherlands]]): [[user:Mennoowh|Mennoowh]] found the [http://coord.info/GC1QR79 GC1QR79] geocache 150 meters from the hashpoint, not in line of sight.
 
* [[2012-03-30 52 5]] ([[Utrecht, Netherlands]]): [[user:Mennoowh|Mennoowh]] found the [http://coord.info/GC1QR79 GC1QR79] geocache 150 meters from the hashpoint, not in line of sight.
 
 
* [[2012-04-05 38 -90]] ([[St. Louis, Missouri]]): [[User:RocketMac|RocketMac]] discovered the [http://coord.info/GC2EVR1 GC2EVR1] geocache 461 feet and within line of sight from the hashpoint.
 
* [[2012-04-05 38 -90]] ([[St. Louis, Missouri]]): [[User:RocketMac|RocketMac]] discovered the [http://coord.info/GC2EVR1 GC2EVR1] geocache 461 feet and within line of sight from the hashpoint.
 
 
* [[2012-06-29 51 5]] ([[Eindhoven, Netherlands]]): [[user:Eupeodes|Eupeodes]] found the [http://coord.info/GC1WXFZ GC1WXFZ] geocache 90 meters from the hashpoint, not in line of sight.
 
* [[2012-06-29 51 5]] ([[Eindhoven, Netherlands]]): [[user:Eupeodes|Eupeodes]] found the [http://coord.info/GC1WXFZ GC1WXFZ] geocache 90 meters from the hashpoint, not in line of sight.
 
 
* [[2012-07-02 52 4]] ([[Amsterdam, Netherlands]]): [[user:Eupeodes|Eupeodes]] found the [http://coord.info/GC2ZKBY GC2ZKBY] geocache 140 meters from the hashpoint, not in line of sight.
 
* [[2012-07-02 52 4]] ([[Amsterdam, Netherlands]]): [[user:Eupeodes|Eupeodes]] found the [http://coord.info/GC2ZKBY GC2ZKBY] geocache 140 meters from the hashpoint, not in line of sight.
 
 
* [[2013-04-07 52 6]] ([[Enschede, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC2VP48 GC2VP48] geocache 470 meters from the hashpoint, not in line of sight.
 
* [[2013-04-07 52 6]] ([[Enschede, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC2VP48 GC2VP48] geocache 470 meters from the hashpoint, not in line of sight.
 
 
* [[2013-05-19 52 5]] ([[Utrecht, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC11CZR GC11CZR] geocache 840 meters from the hash point, not in line of sight.
 
* [[2013-05-19 52 5]] ([[Utrecht, Netherlands]]): [[User:Eupeodes|Eupeodes]] found the [http://coord.info/GC11CZR GC11CZR] geocache 840 meters from the hash point, not in line of sight.
 
 
* [[2013-05-30 52 4]] ([[Amsterdam, Netherlands]]): [[User:Palmpje|Palmpje]] found the [http://coord.info/GC3E2E0 GC3E2E0] geocache 345 meters from the hashpoint, just to get this ribbon.
 
* [[2013-05-30 52 4]] ([[Amsterdam, Netherlands]]): [[User:Palmpje|Palmpje]] found the [http://coord.info/GC3E2E0 GC3E2E0] geocache 345 meters from the hashpoint, just to get this ribbon.
 
 
* [[2013-10-25 49 8]] ([[Mannheim, Germany]]): [[User:Q-Owl|Q-Owl]] found the [http://coord.info/GC36MH4 GC36MH4] geocache 900 meters from the hashpoint, but in line of sight.
 
* [[2013-10-25 49 8]] ([[Mannheim, Germany]]): [[User:Q-Owl|Q-Owl]] found the [http://coord.info/GC36MH4 GC36MH4] geocache 900 meters from the hashpoint, but in line of sight.
 
 
* [[2014-03-06 48 2]] ([[Paris, France]]): [[User:Dunaril|Dunaril]] found the [http://coord.info/GC2FGPZ GC2FGPZ] geocache 500 meters from the hashpoint.
 
* [[2014-03-06 48 2]] ([[Paris, France]]): [[User:Dunaril|Dunaril]] found the [http://coord.info/GC2FGPZ GC2FGPZ] geocache 500 meters from the hashpoint.
 
 
* [[2014-04-20 49 8]] ([[Mannheim, Germany]]): [[User:Q-Owl|Q-Owl]] found the [http://coord.info/GC2RRTR GC2RRTR] geocache 150 meters from the hashpoint, not in line of sight.
 
* [[2014-04-20 49 8]] ([[Mannheim, Germany]]): [[User:Q-Owl|Q-Owl]] found the [http://coord.info/GC2RRTR GC2RRTR] geocache 150 meters from the hashpoint, not in line of sight.
 
 
* [[2014-05-02 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3J4A9 GC3J4A9] geocache 647 meters from the hashpoint, not in line of sight.
 
* [[2014-05-02 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3J4A9 GC3J4A9] geocache 647 meters from the hashpoint, not in line of sight.
 
 
* [[2014-05-21 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC4H3GG GC4H3GG] geocache 971 meters from the hashpoint, not in line of sight.
 
* [[2014-05-21 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC4H3GG GC4H3GG] geocache 971 meters from the hashpoint, not in line of sight.
 
 
* [[2014-05-31 50 10]] ([[Schweinfurt, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC38X55 GC38X55] geocache 473 meters from the hashpoint and within line of sight from the hashpoint.
 
* [[2014-05-31 50 10]] ([[Schweinfurt, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC38X55 GC38X55] geocache 473 meters from the hashpoint and within line of sight from the hashpoint.
 
 
* [[2014-06-02 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GCWH77 GCWH77] geocache 734 meters from the hashpoint, not in line of sight.
 
* [[2014-06-02 51 9]] ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GCWH77 GCWH77] geocache 734 meters from the hashpoint, not in line of sight.
 
+
* [[2014-06-05 51 10]] ([[Goslar, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3EAQ9 GC3EAQ9] geocache 739 meters from the hashpoint, not in line of sight.
* [[2014-06-05 51 10]] ([[Nordhausen, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3EAQ9 GC3EAQ9] geocache 739 meters from the hashpoint, not in line of sight.
 
 
 
 
* [[2014-06-20 52 9]] ([[Hannover, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3XHX2 GC3XHX2] geocache 695 meters from the hashpoint, not in line of sight.
 
* [[2014-06-20 52 9]] ([[Hannover, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3XHX2 GC3XHX2] geocache 695 meters from the hashpoint, not in line of sight.
 
 
* [[2014-10-12 51 13]] ([[Dresden, Germany]]): [[User:Oisín|Oisín]] found the [http://coord.info/GC501DY GC501DY] geocache 319 meters from the hashpoint, not in line of sight.
 
* [[2014-10-12 51 13]] ([[Dresden, Germany]]): [[User:Oisín|Oisín]] found the [http://coord.info/GC501DY GC501DY] geocache 319 meters from the hashpoint, not in line of sight.
 
 
* [[2015-02-25 52 9]] ([[Hannover, Germany]]): [[User:Fippe|Fippe]] found the [http://coord.info/GC3758F GC3758F] geocache about 500 meters from the hashpoint, not in line of sight.
 
* [[2015-02-25 52 9]] ([[Hannover, Germany]]): [[User:Fippe|Fippe]] found the [http://coord.info/GC3758F GC3758F] geocache about 500 meters from the hashpoint, not in line of sight.
 
 
* [[2015-04-17 51 9]], ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3795W GC3795W] geocache 327 meters from the hashpoint, and within line of sight from the hashpoint.
 
* [[2015-04-17 51 9]], ([[Kassel, Germany]]): [[User:GeorgDerReisende|GeorgDerReisende]] found the [http://coord.info/GC3795W GC3795W] geocache 327 meters from the hashpoint, and within line of sight from the hashpoint.
 
 
* [[2015-05-23 66 25]] ([[Rovaniemi, Finland]]): [[User:Isopekka|Isopekka]] found the [http://coord.info/GCMRV9 GCMRV9] geocache 281 metres from the hashpoint, not in line of sight.
 
* [[2015-05-23 66 25]] ([[Rovaniemi, Finland]]): [[User:Isopekka|Isopekka]] found the [http://coord.info/GCMRV9 GCMRV9] geocache 281 metres from the hashpoint, not in line of sight.
 +
* [[2015-09-27 37 -122]] ([[San Francisco|Los Altos Hills, California]]): [[User:Erik_r|Erik_r]] and [[User:meta-alt|meta-alt]] found the [http://coord.info/GC2THTB GC2THTB] geocache about 500 meters from the hashpoint.
 +
*[[2018-08-05 53 9]] ([[Hamburg (West), Germany]]): [[User:Fippe|Fippe]] found the [https://coord.info/GCDCBE GCDCBE] Geocache 380 meters near the Geohash, not in line of sight.
 +
* [[2021-02-09 45 4]] ([[Lyon, France]]): [[User:Baarde|Baarde]] found the [http://coord.info/GC8C9VX GC8C9VX] geocache 777 meters from the hashpoint, not in line of sight.
 +
* [[2021-02-19 32 -96]] ([[Dallas, Texas]]): [[User:Luke|Luke]] and [[User:Gabe|Gabe]] found the [http://coord.info/GC7TFWN GC7TFWN] geocache 455 meters from the hashpoint, not in line of sight.
 +
* [[2023-01-25 47 8]] ([[Zürich, Switzerland]]): [[User:globescorer|globescorer]] found the [https://www.geocaching.com/seek/log.aspx?LUID=6ee8795e-ed81-4ffe-9012-895818219fae GC9NC74] geocache 800 meters from the hashpoint, not in line of sight.
 +
* [[2023-02-15 47 8]] ([[Zürich, Switzerland]]): [[User:globescorer|globescorer]] found the [https://www.geocaching.com/geocache/GC8KW6M GC8KW6M] geocache 200 meters from the hashpoint, not in line of sight.
  
* [[2015-09-27 37 -122]] ([[San Francisco|Los Altos Hills, California]]): [[User:Erik_r|Erik_r]] and [[User:meta-alt|meta-alt]] found the [http://coord.info/GC2THTB GC2THTB] geocache about 500 meters from the hashpoint.
 
 
[[Category:Geocaching]]
 
[[Category:Geocaching]]

Latest revision as of 06:49, 29 October 2023

Hash Collision Icon

Template:Hash collision

Hashcollision.png
This user earned the Hash collision achievement
by discovering a geocache near the ({{{latitude}}}, {{{longitude}}}) geohash on [[{{{date}}} {{{latitude}}} {{{longitude}}}|{{{date}}}]].

Anyone accomplishing this achievement can add this template to their user and/or expedition page.

Visit a geohash and, either through prior knowledge or pure chance, find a geocache on site of the hash. To count as being at the geohash site, the geocache must lie within sight of the circle of uncertainty of your GPS around the geohash coordinates. Placing a cache yourself does not count, unless you placed it before the coordinates of the geohash were announced, but you can place one that helps other geohashers later in the day win this award.

Proof

For proof, the contents of the cache should be photographed, particularly if it has a logbook; feel free to sign it. A link to a geocache site advertising that location would also be good.

Reverse collision

There is now a geocache listing, GC4JCB6, which reverses the challenge. In order for a geocacher to complete the challenge (akin to earning the ribbon) and be able to log the cache as found, the geocacher must find a geocache that is within 1km of a geohash location. It follows that any geohasher that has already earned the Collision Achievement has already completed this geocaching challenge. But rather than introduce geocaching to the geohashing community, this cache serves to introduce geocachers to the concepts of geohashing. Of course, to claim this geocache as found, one would also need to physically visit the geocache, which is located in Southern New Mexico, and it is unlikely that a herd of Geohashers will descend on the state to do so. There are other geocache listings that introduce the concepts of geohashing as well.

You will find another reversed challenge (Safari Cache) at www.opencaching.de: The geocache OCF495 in Berlin/Germany. This cache can be loged as son as you visit your first geohash. There is no need to travel to Berlin.

Winners

Honorable Mention

A geocache discovered within one kilometer of the geohash wins you the honorable mention.