Adequate horsepower is of great importance when a ship is navigating independently in ice. Adequate horsepower is generally considered to exist when the horsepower to length ratio is at least __________.

Correct Answer: Option A — 6 to 1 or better

Navigation in ice requires significant power to overcome resistance and maintain steerage. USCG and industry standards for ice-strengthened vessels generally define adequate power as a ratio of at least 6 horsepower per foot of vessel length to ensure the ability to break ice and maintain headway in pack conditions.