What is the minimum height required for guards or railings to be considered adequate for passenger safety on a vessel?

The minimum height for guards or railings to ensure passenger safety on a vessel is typically established at 6 inches. This height is considered adequate as it provides a sufficient barrier to prevent passengers from accidentally falling overboard while still being low enough for ease of access and visibility. Railings or guards that are too low may not effectively provide safety, especially in rough waters or during abrupt movements of the vessel. The 6-inch height standard strikes a balance between safety and practicality, thereby promoting a safer boating experience for everyone onboard.