Yup that appears to be the one, thank you. Imagine expensive and not available to all & sundry, pleased HEMS have it, wonder whether the wires data might be something SkyDemon can subscribe to and include.
"ACANS gives access to power line, low level obstruction, high accuracy terrain and many other information sources to keep you safe at low level. Users can even add and share newly identified low level dangers with each other, ensuring that everyone always has the latest, best information."