Here is some info on how What3words helps in emergency situations.
If the rescue team does not use What3words they can convert the "three words" into GPS coordinates utilizing a batch converter, the link is below.
How do I use what3words in an emergency?
1. Find the 3 word address for your current location on the free what3words app for iOS and Android. ...
2. Share your 3 word address over the phone to the call handler.
3. The emergency service can then coordinate a response directly to the exact location where help is needed.
https://what3words.com/products/batch-converter
https://what3words.com/news/emergency/three-words-for-a-faster-emergency-response
In the app you can also set so that coordinates will be sent togheter with the three words:
You can also open the menu and tap 'Settings', then 'Share Settings'. Select Latitude & Longitude, and the format you need (decimals, degrees, mins & secs etc.). Now, whenever you share a what3words address, the Latitude and Longitude will be included.