05-28-20, 07:36 AM
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#448
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Watch Officer 
Join Date: Jan 2004
Location: Periscope Depth
Posts: 341
Downloads: 936
Uploads: 0
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It’s all to do with how many masts, cranes, and island structures are on the ships
https://maritime.org/doc/id/oni208-merchant/pg001.htm
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