After you get that thingy enabled do this.
Go to an airfield that has a northern runway at the waters edge.
1. Get in the feild ack on the northe facing runway at the edge of the water.
2. Use the .target xxxx command and start at 400 yards.
3. Work from 400 to 4500 yards. 400, 600, 800, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500
4. Draw a big picture of the manned ack gunsight and use full zoom magnification.
5. At each one of these distances shoot to hit the red horizontal line. It's centered on your gunsight from 0 to infinity. You just need to undertstand the trajectory to get a round to hit at any known distance.
6. When you know you are hitting on the red line, mark your gunsight picture and distance.
You can fire and pull the gunsight aside to see where the rounds are hitting. You will also see hit sprites through the center post of the gunsight if you are hitting on the target. You want to understand where these distances are relative to the gunsight to help you fine tune your elevations when tracking a con. Or shooting tanks attacking your airfield. Eventualy this will help you extrapolate the shore battery and the 5inch on ships.