Your vessel is on a voyage from Ogdensburg, NY, to Chicago, IL, via the Great Lakes. The date is October 3 of the current year. If your vessel is subject to the load line requirements, using illustration D031DG below, to which of her marks should she be loaded?
• Load line seasonal zones and dates for the Great Lakes and St. Lawrence River • Difference between salt water (SW) and fresh water (FW) load lines on the Plimsoll mark • Meaning of the Intermediate (I) vs Winter (W) marks
• First, decide whether your entire route from Ogdensburg, NY, to Chicago, IL, is effectively in salt water, fresh water, or a mix at this time of year • Then, determine what seasonal zone (summer, winter, or an intermediate season) applies on 3 October for the Great Lakes trade • Finally, match that combination of water type and season to the correct horizontal line on the load line diagram
• Verify whether the Great Lakes are treated as fresh water or salt water for load line purposes • Check the seasonal date limits that define when winter or intermediate marks apply in the Great Lakes area • Confirm that the selected mark is on the correct side (SW or FW column) of the diagram and at the correct I or W level for the season
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