All of the different vehicles have complicated HUDs that provide all sorts of useful information. Some of this information I've been able to discover through trial and error (i.e. gun position in the rectangle at the bottom of the attack helicopter gunner view), but a lot of the other HUD details are lost on me.
I hear that you can see jet altitude, but I haven't been able to determine which number on the HUD corresponds to it.
Am I wrong in assuming that there might be useful data in vehicle HUDs, if I was able to read it? Has anyone done a useful guide on what info the HUDs display?