The UZO did not have the tools of the attack periscope IRL. In the video, the watch officer is used to gain range and bearing to target. You could still determine speed by timeing the ship crossing the 0 degree line in the UZO, just as you would in the Attack Periscope. Don't forget about the "Attack Disc" that is included as well. This can also be used for surface attack. As I mentioned befor, the video tutorial is really a great walkthrough on how to use these tools, in various situations.
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