A delayed surface marker buoy (DSMB), decompression buoy, or deco buoy is an inflatable buoy that can be deployed while the diver is submerged and generally only towards the end of the dive. Buoys and markers are the “traffic signals” that guide vessel operators safely along some waterways. They also identify dangerous or controlled areas and give directions and information. *Multiple different styles are available for purchase at A-1 Scuba & Travel Aquatics Center. *Link to DSMB’s on website*
When selecting a DSMB, a few things to keep in mind are visibility (when inflated, does it make it easy for a boat or other divers to find you?), Is it easy to operate, can I use it as a float in case of emergency (Will it support someone’s body weight?), etc. Additional information -> https://www.divessi.com/blog/surface-marker-buoy-7416.html