When you get Speed, AOB and range (where speed and AoB are most vital, range only when fring at high gyro angles), you can unlock the scope yes. And relative bearing (bearing wich the scope says I reckon?) has nothing to do with it.
Only thing of importance is that the TDC is set on AUTO! else the gyro setting isn't updated. So if you see the gyro update (under the stopwatch) your set to fire.
P.s. don't forget to open tubes.
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