https://www.techdirt.com/articles/20190816/04041742793/what3words-is-clever-way-communicating-position-very-simply-do-we-really-want-to-create-monopoly-location-look-ups.shtml

The BBC News site has one of those heart-warming stories that crop up periodically, about how clever new technology averted a potentially dangerous situation. In this case, it describes how a group of people lost in a forest in England were located by rescue services. The happy ending was thanks to the use of the What3words (W3W) app they managed to download following a suggestion from the police when they phoned for help. W3W's creators have divided the world up into 57 trillion virtual squares, each measuring 3m by 3m (10ft by 10ft), and then assigned each of those squares a unique "address" formed by three randomly-assigned words, such as "mile.crazy.shade". The idea is that it's easier to communicate three words generated by the What3words app from your position, than to read out your exact GPS longitude and latitude as a string of numbers. It's certainly a clever approach, but there are number of problems, many of which were discussed in a fascinating post by Terence Eden from earlier this year. The most serious one is that the system is not open:

The algorithm used to generate the words is proprietary. You are not allowed to see it. You cannot find out your location without asking W3W for permission.