Hi cityflyer i suppose your right i guess i thought it could just be easily explained, what it is i dont understand is; Ok a rhumb line track has a constant direction, between 2 points on a sphere? would i be right in saying that rhumb lines can only be done over short distance, because as say LA to London would not be possible with a constant track? (as that would take you somewhere into greenland as the initial heading is approx NE)
Cheers