Drift diving
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Drift diving is a type of recreational diving where the diver is transported by the currents caused by the tide or in a river.
The current gives the diver the impression of flying and allows the diver to cover long distances underwater, possibly seeing more habitats and formations than usual.
Normal precautions for drift diving are to have a supporting boat follow the divers and to use a surface marker buoy.
It is important for the diver to also have knowledge of the local rules pertaining to the use of surface marker buoys, as in some parts of the world, surface marker buoys alone are not legally sufficient signaling devices, and either of the international diver's down flags (in the appropriate size), or perhaps both, might be required while drift diving.