Why does a gong buoy have three bells?

A gong buoy typically has three bells to provide distinct sound signals that can be easily differentiated by mariners. The combination of sounds helps indicate specific navigational information or warnings, such as the buoy's position or the presence of hazards. The three bells can produce a variety of tones, enhancing their visibility and audibility in various weather conditions. This design ensures that the buoy's signals are effective and reliable for safe navigation.