Previous posts/discussions about this discussed how to communicate ones exact location in a remote spot to others, and which location system to use.
Many solutions were offered which made it clear to me that different emergency services in different areas use different systems; and that there is no 'benchmark' of how to do this in an emergency.
I have now installed an App on my phone called 'GB Grid Ref Worker' which sends a text or email with the Northings and Eastings and other map ref. coordinates, you can even attach a picture made on site.
There are many other Apps available that pinpoint your location and allow you to forward the information to someone else (for example to the emergency services)
My question is: If you are on the receiving end, which App/system (installable on a phone) should be used to enter those Coordinates so someone can find that spot quickly?