So the more I learn the more questions arise!

So here they are:

Q1 When you give the command "Commander target" the icon briefly turns blue, and back to white. Does this mean I must press this command after every shot?


Q2 What is the significance of the position of the tick mark!


Q3 What is the significance of the tick colour shading?


Q4 In the first picture what does the small blue box on the right of the "nav bar" represent. Blue implies enemy but what? I dont see anything in map view.....
Zillions more to come!