Hi Flappie,
Thanks for your help on this, but I think I need to go back to the drawing board as there is something more going on here.
I wasn't shooting at a tank, it was a Ford pick up on one of the runways. Which is where the Maverick went (roughly) (I followed it using the F6 view).
Also, although I did put tanks on the map, they were a combination of T-90, T-72 & T-80. That looks like an M1
The WPN page view looks correct, but the TGP page view is most definitely not what I was looking at.
I think I might just scrap the mission map entirely & start again from scratch as a few more issues have cropped.
Once again, thank you for your time & effort.