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Obltn Strand · 01-26-10, 03:04 AM

Historically uboats relied on vigilance of their watch crew and run more than 90% of time in surface. Coal fired ships produce(d) lot smoke which was visible for several miles. Perhaps these small squares on navigation map represent this?

01-26-10, 03:04 AM	#3
Obltn Strand Commodore Join Date: Oct 2009 Location: Helsinki, Finland Posts: 614 Downloads: 135 Uploads: 0	Historically uboats relied on vigilance of their watch crew and run more than 90% of time in surface. Coal fired ships produce(d) lot smoke which was visible for several miles. Perhaps these small squares on navigation map represent this?