The Circuit is an online database collating the location of all registered defibrillators in the UK. Once a unit is registered on this database it is visible to NHS ambulance services and ready to be used in an emergency. Without this, many defibrillators are left unused because emergency services do not know where they are or how to access them. For this reason, it is essential that once your defibrillator has been installed, Dorset and Somerset Air Ambulance are advised so we can then add it to The Circuit and ensure the device is rescue ready.