I guess I don't understand why this is a problem. If you were really in the u-boat watching the merchant you would be able to track the ship using both the muscles in your arms to move the periscope and your eyes to continue visual tracking.
But I guess that's not what you guys are saying....?
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"You will take on England wherever you find her ships, and you will break her power at sea." -- Iron Coffins, Herbert A. Werner
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