I guessed someone made a giant cockup.....last few days shanwick both directions have been advising crews to check shannon volmet re sigmets......in there it says check your navigation re waypoints. Causing a lot of extra chit chat on 123.45 and disturbing the crossword......
Not the first time N5040 and 5040N inputs have been screwed up and yes its a huge threat. Check your tracks and distances and your lats/longs !!