X marks the spot
Did some circuits in a Cessna 150 once at Longside where the QNH was around 945, off my altimeter scale. Twas flat calm so I reckon I was close to the 'X' shown on the synoptic charts. And some time later I had a bimble around the same morning as the English 'hurricane' but I was in a Cessna 172 by then, could handle it better than a 150!
Good luck to you lot who do it for a living and hope that 'X' coincides with localiser established.