Hi. I am new to dog fight and gaming in general. I reached level three where I had to bomb an enemy airfield. I guessed the direction of the airfield from the insert picture and managed to bomb the airfeld. I was shot several times but not once saw another aircraft. On one occassion, I returned to my own airfield, only to be destroyed by enemy fire after landing. Again, I never saw the enemy. What is the significance of the green symbol that changes shape as I move and the red arrow which runs around the screen. Is there a YHelp menu that explains the different symbols?