Its a little indicator you get when you have automatic TDC enabled. It's basically a visual aid to say,
"don't shoot yet (yellow arrow) and, "Shoot!" (when green.)
A better thing to look at is the gyro indiactor. you want as close to 0 gyroangle you can get. You can generally fire within (and not to exceed) 15 degree's before a 0 indicator and not have a foul solution. Once your past 0 degree's may as well, not shoot. I generaly shoot within 5 degrees (usuallyl like 3 to 4 degrees) before a 0 gyro angle to account for the delay that occurs between torpedo's when shooting a salvo. One torpedo seems to equite to a 1 second delay.
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