How does it work? Yes, I've heard and taught a thousand times about frequencies, wattages, classes, errors, and navigating with them. But what does it DO? It seems like they just pump a whole bunch of electrical power out over one frequency, and the ADF senses where its coming from via the loop/sense combo. Is that even remotely correct? And why is it NON-directional as opposed to OMNI-? It transmits in all directions...

Thanks!