Hows about drones that tow target banners near bombers and fighters. Or fixed gunner stands on a range with track and a wheeled target on it that gets pulled at speed left or right 90 degrees of your position. Thats how much of gunnery training took place. Once you get to a 1 to 1 sillouett, why not just chase the drones in the circle?
The drones and the original north facing target complemented each other for many years. You can shoot at the drones from almost any mannable gun platform in the game while offline while using the lead comp gunsight. But, up till now you could not get feedback against a fixed target on the results of your elevation at distance higher than 90ft for your mannable cannon on the ground.
Have you ever wondered what the real elevation relationship is in your gunsight when shooting at fighters from the 37mm manned gun?