What a good idea!
Even better if you use it with What Three Words which is a an app that breaks down EVERY square metre of the planet to a unique three word combination. For example, you could be at homemaker.tasteful.cleanser and someone who has the What Three Words app would be able to know EXACTLY where you are.
This app is also great for finding people at a concert or crowded beach or busy park or in the middle of the bush or forest.