What does the what3words app do?

Edited

The free what3words app lets you find, share and save precise what3words addresses. You can also navigate to what3words addresses. To do this, simply tap Navigate and select your favourite navigation app.

It’s available for iOS or Android devices.

You can find handy step-by-step instructions on how to use the what3words app here: http://what3words.com/how-to-use-the-what3words-app