What is the purpose of an SMB for a diver?

The purpose of a Surface Marker Buoy (SMB) for a diver is primarily to inform topside personnel and boats about the diver's location when they are surfacing. When deployed, the SMB floats to the surface and provides a visible signal of the diver's presence, which is crucial for safety. This is especially important in busy dive areas where boat traffic is prevalent, allowing boat operators to avoid the diver’s location and reduce the risk of accidents.

While communication with dive buddies, signaling other dive groups, and contacting pilots can be important aspects of diving safety and coordination, the main and most vital purpose of an SMB is to ensure that those on the surface, including boats and other personnel, are aware of the diver's position. This visibility helps to prevent collisions and enhances overall safety during a dive.