What is the purpose of a boating safety decal?

A boating safety decal serves a critical function in promoting safe boating practices. Its primary purpose is to demonstrate that a vessel has undergone and successfully passed a safety inspection conducted by a recognized authority. This inspection typically evaluates essential safety equipment, compliance with regulations, and overall seaworthiness. By affixing a safety decal to the vessel, it not only signifies compliance with safety standards but also enhances public awareness about the importance of safety measures on the water. Observing a safety decal can give peace of mind to other boaters and ensure that proper protocols are being followed.

The other options do not accurately reflect the primary intention of the safety decal. While knowing the vessel's size or type is important for various regulations and enforcement, these details are not the focus of the safety decal. Similarly, displaying the owner's contact information may be helpful in certain contexts but is not a function of the safety decal itself.