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I don't see any need to increase the tolerances for the calculations to account for a 1nm offset. In oceanic airspace in Aus. you are considered to have a cross track tolerance of 50nm(yes thats 50nm left and right), in RNP10 airspace its 25, and over land it is 14nm. With current navigation systems a 1nm offsett can easily be asborbed into these tolerances. I would like to see it reduced to 25nm over the ocean and 10nm over land.