Definitely agree that GCMap should be used only as a guide. In my case, I have included tolerances in the GCMap calculations and maybe my tolerance allowed is not enough. So from now, should only aim to reach upto about 29000 miles with a tolerance of about 6000 miles.
When I spoke to the agent, I did not insist that my figures were more correct. I will only put in a surface sector where absolutely necessary.
