In which year did the IMO mandate radar carriage for certain vessel classes?

• A. 1960
• B. 1980
• C. 1972
• D. 1990

Answer: (C)

Radar carriage became mandatory for certain vessel classes in 1972 when the International Maritime Organization amended SOLAS to require radar equipment on ships above a specified size operating on international voyages. This established a global standard, ensuring ships could routinely detect other vessels and shorelines in poor visibility, which greatly enhances collision avoidance. The rule targets particular categories of ships defined by SOLAS, with specific tonnage thresholds spelled out in the amendments. Because the formal mandate was introduced in 1972, that year is the correct one.