I'm not sure whether I'm pushing my luck here!
Ive got 2 more questions to ask.
When you come to calculating mid point longitudes why is it for example that if the track is A to B it is convergency that is added to A but in other examples its added to point B instead. I can't see why??
Furthermore, along the same lines why is it that convergency is either taken away or added to say point A or point B to find the mid point longitude? What are the common laws.
Please help!
Many thanks,
ILS27R