What3words - Revision history

Andrew V: /* References */

2026-04-14T15:26:47Z

References

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	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.
	Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project~~\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch~~\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|archive-url=http://web.archive.org/web/20250722052654/https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|archive-date=22 Jul 2025}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797 \|archive-url=http://web.archive.org/web/20260220180059/https://www.bbc.com/news/technology-57156797 \|archive-date=20 Feb 2026}}</ref>		Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web \|author=Zach Whittaker \|date=29 April 2021 \|title=What3Words sent a legal threat to a security researcher for sharing an open-source project \|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|url-status=live \|archive-url=http://web.archive.org/web/20250722052654/https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|archive-date=22 Jul 2025 \|publisher=[[TechCrunch]]}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797 \|archive-url=http://web.archive.org/web/20260220180059/https://www.bbc.com/news/technology-57156797 \|archive-date=20 Feb 2026}}</ref>
	==Consumer Impact Summary==		==Consumer Impact Summary==
	*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>		*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>

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	*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>		*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>
	*'''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.		*'''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.
	*'''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement}}</ref>		*'''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement \|archive-url=http://web.archive.org/web/20250926144708/https://what3words.com/api-licence-agreement \|archive-date=26 Sep 2025}}</ref>
	*'''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.		*'''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.
	*'''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363 \|archive-url=http://web.archive.org/web/20251103120626/https://www.bbc.com/news/technology-56901363 \|archive-date=3 Nov 2025}}</ref>		*'''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363 \|archive-url=http://web.archive.org/web/20251103120626/https://www.bbc.com/news/technology-56901363 \|archive-date=3 Nov 2025}}</ref>

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	{{~~InfoboxCompany~~		{{CompanyCargo
	\|~~Title~~ = ~~What3Words~~		\|Description=British geolocation system that provides three-word phrases to label every 3x3 meter square on the globe.
	\|Founded = 2013		\|Founded=2013
	\|~~Type~~ = ~~For-Profit~~		\|Industry=Geocoding, GIS
			\|Logo=What3Words example.svg
	\|~~Industry~~ = ~~Geolocation / Addressing System~~		\|ParentCompany=
	\|~~Official~~ Website = [https://what3words.com what3words.com]		\|Type=Private
	~~\|Name=What3Words\|Logo=What3Words example.svg~~}}		\|Website=[https://what3words.com what3words.com]
			}}
	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.
	Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>		Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>

Mr Pollo at 02:04, 22 December 2025

2025-12-22T02:04:58Z

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	==References==		==References==
	<references />		<references />
			[[Category:{{PAGENAME}}]]

TheClippy at 03:16, 7 December 2025

2025-12-07T03:16:59Z

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	\|Industry = Geolocation / Addressing System		\|Industry = Geolocation / Addressing System
	\|Official Website = [https://what3words.com what3words.com]		\|Official Website = [https://what3words.com what3words.com]
	\|Name=What3Words\|Logo=~~QuestionMark~~.svg}}		\|Name=What3Words\|Logo=What3Words example.svg}}
	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.
	Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>		Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>

216.189.198.199 at 03:12, 7 December 2025

2025-12-07T03:12:37Z

216.189.198.199 at 03:09, 7 December 2025

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	{{InfoboxCompany		{{InfoboxCompany
	\|Title = What3Words		\|Title = What3Words
	\|~~Release Year~~ = 2013		\|Founded = 2013
	\|~~Product Type~~ = Geolocation / Addressing System		\|Industry = Geolocation / Addressing System
	~~\|In Production = Yes~~
	\|Official Website = [https://what3words.com what3words.com]		\|Official Website = [https://what3words.com what3words.com]
	}}		}}

216.189.198.199 at 03:08, 7 December 2025

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	{{InfoboxCompany		{{InfoboxCompany
	\|~~title~~ = What3Words		\|Title = What3Words
	\|~~image =~~		\|Release Year = 2013
	~~\|headerstyle = background:#eee;~~		\|Product Type = Geolocation / Addressing System
	~~\|labelstyle = width:150px;~~		\|In Production = Yes
	~~\|datastyle = width:250px;~~		\|Official Website = [https://what3words.com what3words.com]
	~~\|header1 = Basic Information~~
	~~\|label2 = Founded~~
	~~\|data2~~ = 2013
	\|~~label3 =~~ Product Type
	~~\|data3~~ = Geolocation / Addressing System
	\|~~label4 =~~ In Production
	~~\|data4~~ = Yes
	\|~~label5 =~~ Official Website
	~~\|data5~~ = [https://what3words.com what3words.com]
	}}		}}
	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.

216.189.198.199 at 03:05, 7 December 2025

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	{{~~Infobox~~		{{InfoboxCompany
	\|title = What3Words		\|title = What3Words
	\|image =		\|image =

← Older revision		Revision as of 08:12, 23 February 2026
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	}}		}}
	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.
	Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>		Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|archive-url=http://web.archive.org/web/20250722052654/https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/ \|archive-date=22 Jul 2025}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797 \|archive-url=http://web.archive.org/web/20260220180059/https://www.bbc.com/news/technology-57156797 \|archive-date=20 Feb 2026}}</ref>
	==Consumer Impact Summary==		==Consumer Impact Summary==
	*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>		*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>
	*'''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.		*'''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.
	*'''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement}}</ref>		*'''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement}}</ref>
	*'''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.		*'''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.
	*'''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363}}</ref>		*'''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363 \|archive-url=http://web.archive.org/web/20251103120626/https://www.bbc.com/news/technology-56901363 \|archive-date=3 Nov 2025}}</ref>
	==Incidents==		==Incidents==
	===Legal threats against researchers===		===Legal threats against researchers===
	In April 2021, What3Words—through law firm JA Kemp—issued a legal threat to security researcher Aaron Toponce, demanding deletion of tweets referencing the open-source “WhatFreeWords” project, disclosure of any recipients, and removal of all copies of the software.<ref name="tc2021" />		In April 2021, What3Words—through law firm JA Kemp—issued a legal threat to security researcher Aaron Toponce, demanding deletion of tweets referencing the open-source “WhatFreeWords” project, disclosure of any recipients, and removal of all copies of the software.<ref name="tc2021" />
	TechCrunch reported that What3Words claimed the project contained proprietary data and binary information, although it did not seek removal of criticism.<ref name="tc2021" />		TechCrunch reported that What3Words claimed the project contained proprietary data and binary information, although it did not seek removal of criticism.<ref name="tc2021" />
	What3Words previously pursued takedown actions targeting the WhatFreeWords website and related tweets, including a DMCA request and a WIPO complaint that resulted in domain seizure in 2020.<ref>{{cite web\|title=what3words codes in OSM – WhatFreeWords\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>		What3Words previously pursued takedown actions targeting the WhatFreeWords website and related tweets, including a DMCA request and a WIPO complaint that resulted in domain seizure in 2020.<ref>{{cite web\|title=what3words codes in OSM – WhatFreeWords\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words \|archive-url=http://web.archive.org/web/20251004212017/https://wiki.openstreetmap.org/wiki/What3words \|archive-date=4 Oct 2025}}</ref>
	These threats are documented in the Disclose.io database of legal threats against researchers, including entries from September 2019 and April 2021.<ref>{{cite web\|title=Collection of legal threats against good-faith Security Researchers\|publisher=Disclose.io\|url=https://github.com/disclose/research-threats}}</ref>		These threats are documented in the Disclose.io database of legal threats against researchers, including entries from September 2019 and April 2021.<ref>{{cite web\|title=Collection of legal threats against good-faith Security Researchers\|publisher=Disclose.io\|url=https://github.com/disclose/research-threats \|archive-url=http://web.archive.org/web/20260203143504/https://github.com/disclose/research-threats \|archive-date=3 Feb 2026}}</ref>
	===Closed-source model and restrictive licensing===		===Closed-source model and restrictive licensing===
	The OpenStreetMap community characterizes W3W as a “closed system,” noting its use of patented algorithms, encrypted wordlists, copyright protection, and trademark restrictions that prevent interoperability or integration with open datasets.<ref name="osm" />		The OpenStreetMap community characterizes W3W as a “closed system,” noting its use of patented algorithms, encrypted wordlists, copyright protection, and trademark restrictions that prevent interoperability or integration with open datasets.<ref name="osm" />
	What3Words’ API Licence Agreement further restricts usage by defining “What3Words Data” broadly, imposing request limits, and requiring prior approval for NGO use exceeding 75,000 monthly API calls.<ref name="api" />		What3Words’ API Licence Agreement further restricts usage by defining “What3Words Data” broadly, imposing request limits, and requiring prior approval for NGO use exceeding 75,000 monthly API calls.<ref name="api" />
	The OpenStreetMap Foundation’s licensing guidance identifies structural incompatibilities between W3W’s restrictive terms and ODbL-licensed open data, advising against use of proprietary addressing schemes in open geographic projects.<ref>{{cite web\|title=Licence Compatibility\|publisher=OpenStreetMap Foundation\|date=16 March 2017\|url=https://osmfoundation.org/wiki/Licence/Licence_Compatibility}}</ref>		The OpenStreetMap Foundation’s licensing guidance identifies structural incompatibilities between W3W’s restrictive terms and ODbL-licensed open data, advising against use of proprietary addressing schemes in open geographic projects.<ref>{{cite web\|title=Licence Compatibility\|publisher=OpenStreetMap Foundation\|date=16 March 2017\|url=https://osmfoundation.org/wiki/Licence/Licence_Compatibility \|archive-url=http://web.archive.org/web/20260218095918/https://osmfoundation.org/wiki/Licence/Licence_Compatibility \|archive-date=18 Feb 2026}}</ref>
	===Ambiguity, similarity errors, and emergency response failures===		===Ambiguity, similarity errors, and emergency response failures===
	Multiple BBC investigations documented incidents where What3Words locations were miscommunicated or incorrect in emergency scenarios:		Multiple BBC investigations documented incidents where What3Words locations were miscommunicated or incorrect in emergency scenarios:
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	*'''US Patent 10,909,318''' – “Method for suggesting one or more multi-word candidates…” (Granted Feb 2, 2021).<ref>{{cite web\|title=What3Words—Patent 10,909,318\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>		*'''US Patent 10,909,318''' – “Method for suggesting one or more multi-word candidates…” (Granted Feb 2, 2021).<ref>{{cite web\|title=What3Words—Patent 10,909,318\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>
	*'''US Patent 11,017,169''' – “Method for suggesting candidate words as replacements…” (Granted May 25, 2021).<ref>{{cite web\|title=What3Words—Patent 11,017,169\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>		*'''US Patent 11,017,169''' – “Method for suggesting candidate words as replacements…” (Granted May 25, 2021).<ref>{{cite web\|title=What3Words—Patent 11,017,169\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>
	What3Words also disclosed IPR to the IETF for draft-saywhere, referencing CA2909524A1.<ref>{{cite web\|title=WHAT3WORDS Ltd IPR Disclosure\|publisher=IETF Datatracker\|date=18 October 2025\|url=https://datatracker.ietf.org/ipr/7025/}}</ref>		What3Words also disclosed IPR to the IETF for draft-saywhere, referencing CA2909524A1.<ref>{{cite web\|title=WHAT3WORDS Ltd IPR Disclosure\|publisher=IETF Datatracker\|date=18 October 2025\|url=https://datatracker.ietf.org/ipr/7025/ \|archive-url=http://web.archive.org/web/20251111204753/https://datatracker.ietf.org/ipr/7025/ \|archive-date=11 Nov 2025}}</ref>
	===Public statements and disputes with critics===		===Public statements and disputes with critics===
	In response to criticism, What3Words frequently asserts that:		In response to criticism, What3Words frequently asserts that:

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	\|Title = What3Words		\|Title = What3Words
	\|Founded = 2013		\|Founded = 2013
			\|Type = For-Profit

	\|Industry = Geolocation / Addressing System		\|Industry = Geolocation / Addressing System
	\|Official Website = [https://what3words.com what3words.com]		\|Official Website = [https://what3words.com what3words.com]
	}}		\|Name=What3Words\|Logo=QuestionMark.svg}}
	'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.		'''[https://en.wikipedia.org/wiki/What3words What3Words]''' (W3W) is a proprietary geolocation system developed by What3Words Limited, assigning three-word combinations to 3×3 meter squares across the globe. It is marketed as a simple alternative to latitude/longitude for navigation, logistics, and emergency services. The system is entirely closed-source and is protected by patents, copyrighted wordlists, and trademarks.
	Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>		Although widely promoted for consumer use, What3Words has been the subject of significant criticism from security researchers, mapping experts, emergency response professionals, and open-data advocates. Criticisms focus on its proprietary nature, licensing restrictions, algorithmic opacity, similarity-based errors in safety-critical contexts, and the company’s history of issuing legal threats against researchers who attempted to analyze or replicate the system.<ref name="tc2021">{{cite web\|title=What3Words sent a legal threat to a security researcher for sharing an open-source project\|author=Zach Whittaker\|date=29 April 2021\|publisher=TechCrunch\|url=https://techcrunch.com/2021/04/30/what3words-legal-threat-whatfreewords/}}</ref><ref name="bbc2021a">{{cite web\|title=Rescuers question what3words' use in emergencies\|author=Chris Vallance\|date=31 May 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-57156797}}</ref>
	== Consumer Impact Summary ==		==Consumer Impact Summary==
	* '''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>		*'''User Freedom:''' Limited; closed-source design, restrictive API license, and prohibitions on independent implementations.<ref name="osm">{{cite web\|title=what3words codes in OSM\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>
	* '''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.		*'''Transparency:''' Poor; the algorithm, wordlists, and error handling are not publicly auditable.
	* '''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement}}</ref>		*'''Business Model:''' Proprietary licensing, metered API access, and restrictions on redistribution of derived data.<ref name="api">{{cite web\|title=API Licence Agreement\|publisher=What3Words\|date=17 April 2025\|url=https://what3words.com/api-licence-agreement}}</ref>
	* '''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.		*'''Market Competition:''' Faces criticism compared to open alternatives such as Plus Codes, traditional coordinates, and Mapcodes.
	* '''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363}}</ref>		*'''Public Safety Impact:''' Mixed; documented cases of miscommunication and near-miss incidents have raised concern among emergency services.<ref name="bbc2021b">{{cite web\|title=App used by emergency services under scrutiny\|date=28 April 2021\|publisher=BBC News\|url=https://www.bbc.com/news/technology-56901363}}</ref>
	== Incidents ==		==Incidents==
	=== Legal threats against researchers ===		===Legal threats against researchers===
	In April 2021, What3Words—through law firm JA Kemp—issued a legal threat to security researcher Aaron Toponce, demanding deletion of tweets referencing the open-source “WhatFreeWords” project, disclosure of any recipients, and removal of all copies of the software.<ref name="tc2021" />		In April 2021, What3Words—through law firm JA Kemp—issued a legal threat to security researcher Aaron Toponce, demanding deletion of tweets referencing the open-source “WhatFreeWords” project, disclosure of any recipients, and removal of all copies of the software.<ref name="tc2021" />
	TechCrunch reported that What3Words claimed the project contained proprietary data and binary information, although it did not seek removal of criticism.<ref name="tc2021" />		TechCrunch reported that What3Words claimed the project contained proprietary data and binary information, although it did not seek removal of criticism.<ref name="tc2021" />
	What3Words previously pursued takedown actions targeting the WhatFreeWords website and related tweets, including a DMCA request and a WIPO complaint that resulted in domain seizure in 2020.<ref>{{cite web\|title=what3words codes in OSM – WhatFreeWords\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>		What3Words previously pursued takedown actions targeting the WhatFreeWords website and related tweets, including a DMCA request and a WIPO complaint that resulted in domain seizure in 2020.<ref>{{cite web\|title=what3words codes in OSM – WhatFreeWords\|publisher=OpenStreetMap Wiki\|url=https://wiki.openstreetmap.org/wiki/What3words}}</ref>
	These threats are documented in the Disclose.io database of legal threats against researchers, including entries from September 2019 and April 2021.<ref>{{cite web\|title=Collection of legal threats against good-faith Security Researchers\|publisher=Disclose.io\|url=https://github.com/disclose/research-threats}}</ref>		These threats are documented in the Disclose.io database of legal threats against researchers, including entries from September 2019 and April 2021.<ref>{{cite web\|title=Collection of legal threats against good-faith Security Researchers\|publisher=Disclose.io\|url=https://github.com/disclose/research-threats}}</ref>
	=== Closed-source model and restrictive licensing ===		===Closed-source model and restrictive licensing===
	The OpenStreetMap community characterizes W3W as a “closed system,” noting its use of patented algorithms, encrypted wordlists, copyright protection, and trademark restrictions that prevent interoperability or integration with open datasets.<ref name="osm" />		The OpenStreetMap community characterizes W3W as a “closed system,” noting its use of patented algorithms, encrypted wordlists, copyright protection, and trademark restrictions that prevent interoperability or integration with open datasets.<ref name="osm" />
	What3Words’ API Licence Agreement further restricts usage by defining “What3Words Data” broadly, imposing request limits, and requiring prior approval for NGO use exceeding 75,000 monthly API calls.<ref name="api" />		What3Words’ API Licence Agreement further restricts usage by defining “What3Words Data” broadly, imposing request limits, and requiring prior approval for NGO use exceeding 75,000 monthly API calls.<ref name="api" />
	The OpenStreetMap Foundation’s licensing guidance identifies structural incompatibilities between W3W’s restrictive terms and ODbL-licensed open data, advising against use of proprietary addressing schemes in open geographic projects.<ref>{{cite web\|title=Licence Compatibility\|publisher=OpenStreetMap Foundation\|date=16 March 2017\|url=https://osmfoundation.org/wiki/Licence/Licence_Compatibility}}</ref>		The OpenStreetMap Foundation’s licensing guidance identifies structural incompatibilities between W3W’s restrictive terms and ODbL-licensed open data, advising against use of proprietary addressing schemes in open geographic projects.<ref>{{cite web\|title=Licence Compatibility\|publisher=OpenStreetMap Foundation\|date=16 March 2017\|url=https://osmfoundation.org/wiki/Licence/Licence_Compatibility}}</ref>
	=== Ambiguity, similarity errors, and emergency response failures ===		===Ambiguity, similarity errors, and emergency response failures===
	Multiple BBC investigations documented incidents where What3Words locations were miscommunicated or incorrect in emergency scenarios:		Multiple BBC investigations documented incidents where What3Words locations were miscommunicated or incorrect in emergency scenarios:
	Mountain Rescue England and Wales reported dozens of cases of callers giving incorrect W3W addresses due to spelling errors, accents, or similar-sounding word triplets.<ref name="bbc2021a" />		Mountain Rescue England and Wales reported dozens of cases of callers giving incorrect W3W addresses due to spelling errors, accents, or similar-sounding word triplets.<ref name="bbc2021a" />
	A Keswick Mountain Rescue incident placed a casualty miles away from their true location when a misheard W3W address was given; PhoneFind provided the correct grid reference.<ref name="bbc2021b" />		A Keswick Mountain Rescue incident placed a casualty miles away from their true location when a misheard W3W address was given; PhoneFind provided the correct grid reference.<ref name="bbc2021b" />
	Security researcher Andrew Tierney demonstrated that many W3W squares contain highly similar three-word addresses, increasing risk in safety-critical situations; BBC coverage echoed these findings and W3W’s claim that its “Autosuggest” feature mitigates errors.<ref name="bbc2021b" />		Security researcher Andrew Tierney demonstrated that many W3W squares contain highly similar three-word addresses, increasing risk in safety-critical situations; BBC coverage echoed these findings and W3W’s claim that its “Autosuggest” feature mitigates errors.<ref name="bbc2021b" />
	=== Patents and intellectual property claims ===		===Patents and intellectual property claims===
	What3Words holds multiple U.S. patents related to candidate word suggestion, error correction, and mapping input strings to wordlists, including:		What3Words holds multiple U.S. patents related to candidate word suggestion, error correction, and mapping input strings to wordlists, including:
	* '''US Patent 10,909,318''' – “Method for suggesting one or more multi-word candidates…” (Granted Feb 2, 2021).<ref>{{cite web\|title=What3Words—Patent 10,909,318\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>		*'''US Patent 10,909,318''' – “Method for suggesting one or more multi-word candidates…” (Granted Feb 2, 2021).<ref>{{cite web\|title=What3Words—Patent 10,909,318\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>
	* '''US Patent 11,017,169''' – “Method for suggesting candidate words as replacements…” (Granted May 25, 2021).<ref>{{cite web\|title=What3Words—Patent 11,017,169\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>		*'''US Patent 11,017,169''' – “Method for suggesting candidate words as replacements…” (Granted May 25, 2021).<ref>{{cite web\|title=What3Words—Patent 11,017,169\|publisher=Justia Patents\|url=https://patents.justia.com/assignee/what3words-limited}}</ref>
	What3Words also disclosed IPR to the IETF for draft-saywhere, referencing CA2909524A1.<ref>{{cite web\|title=WHAT3WORDS Ltd IPR Disclosure\|publisher=IETF Datatracker\|date=18 October 2025\|url=https://datatracker.ietf.org/ipr/7025/}}</ref>		What3Words also disclosed IPR to the IETF for draft-saywhere, referencing CA2909524A1.<ref>{{cite web\|title=WHAT3WORDS Ltd IPR Disclosure\|publisher=IETF Datatracker\|date=18 October 2025\|url=https://datatracker.ietf.org/ipr/7025/}}</ref>
	=== Public statements and disputes with critics ===		===Public statements and disputes with critics===
	In response to criticism, What3Words frequently asserts that:		In response to criticism, What3Words frequently asserts that:
	Human error can occur with any addressing system, and W3W’s Autosuggest is designed to reduce ambiguous input.<ref name="bbc2021a" />		Human error can occur with any addressing system, and W3W’s Autosuggest is designed to reduce ambiguous input.<ref name="bbc2021a" />
	Communication errors also occur with coordinates or grid references, a point highlighted in BBC interviews during coverage of emergency mislocation incidents.<ref name="bbc2021b" />		Communication errors also occur with coordinates or grid references, a point highlighted in BBC interviews during coverage of emergency mislocation incidents.<ref name="bbc2021b" />
	In TechCrunch’s coverage of legal threats, CEO Chris Sheldrick stated that enforcement actions targeted unauthorized copies containing proprietary binary material and that W3W was not seeking to suppress criticism.<ref name="tc2021" />		In TechCrunch’s coverage of legal threats, CEO Chris Sheldrick stated that enforcement actions targeted unauthorized copies containing proprietary binary material and that W3W was not seeking to suppress criticism.<ref name="tc2021" />
	== References ==		==References==
	<references />		<references />