distance between two points on the earth

[aslan1982]

hi bfisk

I completely forgot about the north south component. thanks for reminding me

I worked out the RL distance using Pythagorus and I got 1872 nm

I think you went wrong for the 600 part of the calculation

It should have been 516nm 600 x cos30 = 516

so 516sq + 1800sq = Xsq

so x = 1872 for the rhumb line

you worked out the GC to be 1845 which seems correct for this distance

any idea how you actually work out the GC distance ??