The Waypoints feature needs two things - the software on the controller for you to tap on a map, and the firmware in the drone to fly the mission. The H520 (and H920 plus) add 'Actions' - the ability to pause at waypoints, take a photo or panorama, start and stop video - all of which needs new firmware on the drone itself.
You can certainly run the software on our regular ST-16 - that's what UAV Toolbox does. You can plan Cable Cam missions on the ST-16 with my app. I get regular requests to add features like the new Waypoint Actions to UAV Toolbox, but without the firmware upgrade on the drone itself I can only give you half of the story. The new Waypoint software for the ST-16 sold with the H520 is designed to work with the latest firmware on the drone, so it will not work with the older H480 until we get the firmware upgrade.