On Sun, 5 Aug 2012 09:51:17 +0100, "Brian Gaff"
wrote:

Now they can resupply in 6 hours, one assumes only if the orbit and pad are
in the correct relationships, it seems that its not that difficult after
all.

I think higher latitudes have more opportunities, because the Earth's
rotation is drawing a smaller circle up that far north, and the
distance between the pad and the orbit increases more slowly. You
still need sophisticated avionics, and only the recent upgrade to the
digital flight control system of Soyuz/Progress made it feasible.

Brian