The other day, i dived from 7k to bombed a GV. The individual that i killed PM me, asking me how i could see him from that high up. From 7-8 k, GVs show up as little black squares, for some other reason. There are times that they stand out well and other times i have to look harder. From being that high, 75% of the time i can tell if it is a jeep, flak, M-8 or tank. Specifically knowing what kind of GV (mostly tank) i really do not know until i get 1.5 k icon.