distance

hello Nabeel

i have a small question about the distance calculator in the admin/add route

if i add a rout you can calculate the correct distance or let it calculate auto

now my question if i let it calculate it give a number.

example:eblg-vhhh=6064.249

now if i let it calculate via a tool i found on the net it give met for the same 2 airports this

5041.51 ( http://www.airrouting.com/content/TimeDistanceForm.aspx)link to tool

can you explane the difference