22 Jan 2007 From: A.T. Mynydd Craig Goch: Nantlle does anyone know when was the last time mynydd craig goch was syrveyed? I do know it has gone through many height values in its time - all a around the 2,000ft mark. It is currently at 609m. i went up yesterday with my GPS and it gave me a reading of 611m. How often do the O.S. check these thing?