USN also used a technique called "high-scoping". While on the surface, they'd raise the scope to max and peer over the horizon for targets. Sometimes atmospheric phenomonen occurred and allowed for further distances to be viewed, particularly north of Japan in Kurile Islands, Kamchatka, & Sea of Okhotsk.
Cheers,
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During times of universal deceit, telling the truth becomes a revolutionary act.
~ George Orwell
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