Use the material in Section 1, the blue pages, of the Stability Data Reference Book. If the KG is 25.8 feet, and the drafts are: FWD 15'-02", AFT 15'-10"; at what angle will the vessel lose positive stability?

Correct Answer: Option A — 73°

Applying the lighter displacement corresponding to the 15-foot draft range alongside a KG of 25.8 feet within the blue pages yields a vanishing angle of stability of 73 degrees.