When a unit mode is changed, hovering the pointer over the unit displays the countdown until mode switch is complete. However, I notice that some units seem to cycle around a countdown for no apparent reason. For example a sub in Active Sonar Mode counts down to zero and then starts again. Same for battleships. Those in Attack Mode but not engaging do not have a countdown. However, those in Attack Mode and actively engaging targets cycle around a 20 second countdown. So, what is the countdown for as the unit has already switched mode?
I just know I'm going to feel stupid when I get the answer


