What is a surface marker buoy used for

What is a surface marker buoy used for? (Safety diving equipment)

When it comes to scuba diving safety, a surface marker buoy is an essential piece of scuba diving equipment. A surface marker buoy (SMB or a Blob) remains on the surface for the duration of the dive, which is connected by a nylon line to a reel the diver holds. The surface marker indicates the diver’s position to the dive boat skipper at the surface, whilst the diver is underwater. Surface marker buoys are particularly used for safety during drift diving.

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