In sweden we fly at +- 0,5 Nm... I belive that it's the standard in Europe as well except for the UK where they do everything in their own way... =)
It mayby the standard in sweden...it certainly isnt in Germany or Spain, France, or come to think of it Italy either
Perhaps you are talking about the tolerances that you were trained too that were considered acceptable, many moons ago in a galaxy far far away 1/2 a mile each side of the arc sounds familiar
