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Glossary

Glossary - U

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UNIDIRECTIONAL ROTATING BEZEL

An elapsed time rotating bezel, often found on divers' watches, that moves only in a counterclockwise direction. It is designed to prevent a diver who has unwittingly knocked the bezel off its original position from overestimating his remaining air supply. Because the bezel moves in only one direction, the diver can err only on the side of safety when timing his dive. Many divers' watches are ratcheted, so that they lock into place for greater safety.

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UNIVERSAL TIME

The mean solar time of the Greenwich meridian, counted from noon to noon, Often confused with the mean time notion.

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