The stabilized azimuth line provides a "line in space" within the field of view. It was used to determine speed of a target. The line was electrically governed by the subs gyro compass which kept the line at a singular position, irregardless of the subs possible changing position.
Once the line was "plugged in" (it was not good to leave it operating for too long because the synchronizing motor could fog up the interior of the scope) the passage of the target over the line was timed with a stop watch, then calculated using the estimated target length to determine target speed.
The "clutch" was used to engage the synchronous motor, that was governed by the compass. You had a cord that really was "plugged in" to make it work.
As you can see, the Periscope gave you Speed, Range, Target Course....all in one easy process. The game missed the actual simulation of this by a large margin. Not only giving us wrong height measurements, wrong scaled viewing, no length measurements (accurate or not), and incomplete simulated features of the devises used in real life.
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The HMS Shannon vs. USS Chesapeake outside Boston Harbor June 1, 1813
USS Chesapeake Captain James Lawrence lay mortally wounded...
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.."tell the men to fire faster, fight 'till she sinks,..boys don't give up the ship!"
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