What is the primary purpose of using a surface marker buoy during a dive?

The primary purpose of using a surface marker buoy during a dive is to signal the surface location of an underwater diver. This device serves as an important safety measure, particularly in open water environments where visibility can be poor. By deploying a surface marker buoy, divers can ensure that their position is clearly marked for boat operators, support teams, or other divers. This reduces the risk of accidental collisions and enhances the overall safety of the diving operation, allowing for a more effective and secure diving experience.

While a surface marker buoy can be associated with various functions, such as indicating the start of a dive or marking particular underwater features, its essential role lies in providing a visual reference for those above the water to locate and keep track of divers submerged below.