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Jeannius said:
Rule 9 Only applies in channels and where vessels are constrained by draught to remain within that channel.

The only way to understand the rules is to read the original (here's a link http://www.sailtrain.co.uk/Irpcs/pdf/IRPCS.pdf ) not a Wikipedia or other interpretation of the rules.

Yes Mike I agree but I assumed a cruise ship leaving harbor would be in a channel or fairway. I also agree you shouldn't rely on Wiki or interpretation of the rules. They are laid out pretty clear. http://www.navcen.uscg.gov/pdf/navRules/navrules.pdf
You are well respected around here. Would you care to comment on the rule about large boat vs small boat?

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