I can use a trick to do that: I send a push notification without the "alert" token and I store it silently locally (I found out that without the "alert" parameter the notification will not show in the notification tray if the app is running in the background).

Later on, I trigger the alert if the location criteria is matched (of course, I must send geo-coordinates and a radius as message parameters). Is there a more effective / logical way to do that?

Any help is welcome

Miguel