Hi Rod
Thanks for that - I wasn't aware that the path vector changed according to a/c speed.
I am finding that the trails on network data don't really show up that well. Usually the "dots" are well spaced because of the length of time between updates, so it is difficult to see at a glance which direction teh a/c is heading. However I have found by changing the "image" to an aircraft, rather than the square helps.
I hope that makes sense.
Cheers
Mark