That's the obvious solution, kind of surprised they didn't reach for it first time. But fixed now. Nicely done by our Mr Heaton, and a good writeup here by Thomas - it's almost a textbook example of "hacking", for lack of a better term., deriving information that on first glance doesn't appear to be there.
My only confusion was finding what I'd always called triangulation is, in fact, something a bit different, and wondering how that Wikipedia page could make something I demonstrated to my 9yo with three bits of string so unfathomably complex.
Biting the hand that feeds IT
