Recording of the first field exercise of the IOPES project, which took place on May 27, 2021 at the BCN Drone Center facilities, in Collsuspina, Barcelona (Spain). Through three use cases, it is demonstrated how the different technologies involved cooperate to achieve a real-time positioning of the emergency teams, whether it be outdoors or indoors. More information about the IOPES project: https://iopes-project.eu/