Game: the user comes to the GPS point, he receives a new message. How to organize, is there such an application?

Question

Android

Good afternoon!
We organize the game, its essence is this - the user comes to the point, his geolocation is determined, he receives a message / photo with a hint to the next point. Well, the quest is stupid, only events are automatically triggered by points. Users themselves allow GPS and all such an application.
But I'm either looking badly, or I can't correctly formulate a query in a search engine. What applications can implement such a thing?

Answer 1

If automatically, then:
Write.
You can not write yourself - order from someone who can.
If the user himself will send his coordinates, then you can implement it with any messenger. Yes, even Whatsapp or Telegram allow users to send their coordinates in messages.

Answer 2

Like this?
https://vc.ru/tribuna/20223-surprise-me