What is a delayed surface marker buoy

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

A delayed surface marker buoy (DSMB), is similar to a surface marker buoy except that it’s deployed at the end of your dive vs used for the duration of the dive. A DSMB, which is also known as a decompression buoy or a deco buoy, are often used for safe diving ascents from depth on decompression stop dives. They are also used to indicate a diver’s position on ascent. This helps the dive boat skipper spot divers on the surface, especially in seas with a big swell.

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