You can use the coordinate device so it will constantly update the coordinates. Each time it updates run a check to see if the x and y are within one of the three zones. You could use the checker device or block code.
To my understanding, the topic I made below transmits on a channel every 0.5 seconds whenever a player in inside the area. [1]
It might be less than 0.5 seconds, I just put a number out there. ↩︎