The transmission array was completely different as compared to the transmission devices. While the transmission devices could only transport a person or a group of people to a single location, the transmission array was completely different.
It was capable of transporting people to different parts, as long as those cities had the transmission devices activated, and locked with the transmission array.
Additionally, each and every person that was being transported to a different city would have to have a device with them that contained the coordinates of the location that they would be transported to.
Samuel and the other people that were being transported to different cities all had the coordinates locked on their communication watches. There was an application that was installed on their watches, allowing it to be linked with the transmission array.