Height of eye
When I was serving o the USS Pasadena and we were surfaced I would stand watch as the "Contact Coordinator". With our #2 periscope raised we could easily see out to 20kyds. That height of eye was around 42', so I am sure a BB that had range finders and observation towers 90-100' in the air could easily see out to 30kyds with good optics. The best I ever did was 27kyds with the #2 scope, on a flat sea.
Frank
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