Very nice map, looks much more refined but a correction
-Aksum should be included because (even though at the time it was a minor state) would be extreemly prominent and important in a few hundreed years due to eliminating its enemies and becoming the premier tradeing state on the entire east african coast (i'm an american from east africa so i noticed this quite a while back)
-if you ever think about expanding a possibly helpful link including other regions (it is based on the impact of the nabateans, however and is thus limited)
scroll down and it provides a map of indian ocean civilizations around 250 BC:
http://nabataea.net/vietnam.html
it is mostly trade routes, however