Your drafts are: FWD 6'-2", AFT 6'-8". From past experience, you know that the vessel will increase her draft 1 inch for every 6 tons loaded. There is rig water on board and 23 tons of deck cargo. How many more tons of cargo can be loaded and still maintain the same trim? See illustration D037DG below.
Official USCG Answer & Rule Citation
Correct Answer: Option D — 6 tons
Determining permissible cargo loading involves evaluating maximum allowable draft limits from stability reference illustrations, calculating available immersion inches, and applying the vessel-specific tons-per-inch ratio while deducting existing weights to maintain correct trim.
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