Think i understand the first one now, so you have to multiply the 4 by 2 to get the convergency, which is what great circles cahnge by and then apply the rules of adding and subtracting. I managed to work everything else out, just not why it was 228 instead of 224 but i understand that now, i think i have been confusing intial and fianl great circle tracks with bearings, that's my problem.
Still not sure on the second one, going to read it again, takes me a few times for it all to sink in.
Thanks for the help
