You are loading at port A, governed by the summer load line mark, for a voyage to port B, governed by the winter mark. The fresh water allowance is 10", and the hydrometer reads 1.020. Which statement is TRUE?
• Load line zones and seasons – difference between summer and winter marks • Fresh water allowance (FWA) and how to adjust draft when not in full salt water • Use of hydrometer readings (e.g., 1.020) to find how much of the FWA to apply in brackish water
• How does the required draft at the winter load line compare to the summer load line – is the winter mark higher or lower on the side of the vessel? • If the FWA is 10 inches in pure fresh water, how do you scale that allowance when the specific gravity is 1.020 instead of 1.000? • Once you know the effective brackish water allowance, how much (if any) can you load above the summer mark and still be at or above the winter mark when you reach the winter zone?
• Be sure you know which way the draft changes when moving from brackish/fresh water to denser salt water. • Confirm how a hydrometer reading of 1.020 compares to full sea water (about 1.025) and pure fresh water (1.000). • Check which options correctly combine (1) the requirement to comply with the winter mark in the winter zone and (2) the calculated brackish water allowance from the given FWA and specific gravity.
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