A good mobile app I've used which is great for breakdown or emergancy is What3Words (https://what3words.com/products/what3words-app/).
If you download the app which is free, it will generate 3 words which is within 3m x 3m area. and share it for anyone to locate you.
Here is the start point https://w3w.co/useful.letter.beast
Magic and may be a good note for anyone during the RBRR