Brian Barker wrote
Yes, if your locale needs semicolons as separators commas will not do. That is definitely what error 509 will be signalling.
Odd that the locale would change the sign used in functions. Brian Barker wrote
That is because you have - weirdly - chosen to mess up my formula, changing my "E" (for east) into "O" (for west). So *of course* the longitude signs are now reversed. Reinstate my "E" and everything will work.