What is the minimum diameter for a black ball day shape?

What is the minimum diameter for a black ball day shape?

• A. 0.3 meters
• B. 0.6 meters
• C. 0.9 meters
• D. 1.2 meters

Answer: (B)

A day signal of a black ball is used to show a vessel not under command, and the Regulations require that such day shapes be a visible, standardized size. The minimum diameter specified for a ball day shape is 0.6 meters, ensuring it can be seen at typical surveying distances in daylight. Larger sizes are allowed, but the question asks for the smallest acceptable size, which is 0.6 meters. The other options are either too small to meet the requirement or simply exceed the minimum without being necessary.

A day signal of a black ball is used to show a vessel not under command, and the Regulations require that such day shapes be a visible, standardized size. The minimum diameter specified for a ball day shape is 0.6 meters, ensuring it can be seen at typical surveying distances in daylight. Larger sizes are allowed, but the question asks for the smallest acceptable size, which is 0.6 meters. The other options are either too small to meet the requirement or simply exceed the minimum without being necessary.