Photomonage of <a href="https://en.wikipedia.org/wiki/Nitrox" class="extiw" title="en:Nitrox">Enriched Air Nitrox</a> diving tables, which is a safety tool nowadays obsolete in its original use under water, but still used for previous dive <i>planning</i>, backup, and training purposes, and a Citizen automatic mechanical diving watch, and a depth gauge from company Mares. These three items (diving decompression table (only one), depth gauge, diving watch) were absolutely mandatory safety equipment, which was used in conjunction with each other, for recreational and professional divers up to ca. the middle of the 1990s, after which personal <a href="https://en.wikipedia.org/wiki/dive_computer" class="extiw" title="en:dive computer">dive computers</a> became an affordable standard tool even for amateur divers. The computer made the combined use of the three items for <a href="https://en.wikipedia.org/wiki/decompression_practice" class="extiw" title="en:decompression practice">decompression practice</a> unnecessary. Diving tables are partly still used to previously plan a dive (how deep, how long, which time to stay at which interesting site having certain depth under water, etc.)
<ul><li><a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" title="File:Nitrox tables.JPG">File:Nitrox tables.JPG</a>: --<b><a href="https://en.wikipedia.org/wiki/User:Legis" class="extiw" title="en:User:Legis">Legis</a></b> <small>(<a href="https://en.wikipedia.org/wiki/User_talk:Legis" class="extiw" title="en:User talk:Legis">talk</a> - <a href="https://en.wikipedia.org/wiki/Special:Contributions/Legis" class="extiw" title="en:Special:Contributions/Legis">contribs</a>)</small></li>
<li><a href="//commons.wikimedia.org/wiki/File:Mares_depth_pressure_gauge.jpg" title="File:Mares depth pressure gauge.jpg">File:Mares depth pressure gauge.jpg</a>: <a href="//commons.wikimedia.org/wiki/User:Yoruno" title="User:Yoruno">User:Yoruno</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_(without_background).jpg" title="File:Citizen Eco-Drive Diver's 200m - Diving watch (without background).jpg">File:Citizen Eco-Drive Diver's 200m - Diving watch (without background).jpg</a>: <a href="//commons.wikimedia.org/wiki/User:Pittigrilli" title="User:Pittigrilli">Pittigrilli</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Pittigrilli" title="User:Pittigrilli">Pittigrilli</a></li></ul>
CC BY-SA 3.0
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<ul><li> <a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" title="File:Nitrox tables.JPG">Nitrox tables.JPG</a>: <a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" class="image"><img alt="Nitrox tables.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/50px-Nitrox_tables.JPG" decoding="async" width="50" height="31" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/75px-Nitrox_tables.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/100px-Nitrox_tables.JPG 2x" data-file-width="1049" data-file-height="656"></a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Mares_depth_pressure_gauge.jpg" title="File:Mares depth pressure gauge.jpg">Mares depth pressure gauge.jpg</a>: <a href="//commons.wikimedia.org/wiki/File:Mares_depth_pressure_gauge.jpg" class="image"><img alt="Mares depth pressure gauge.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Mares_depth_pressure_gauge.jpg/50px-Mares_depth_pressure_gauge.jpg" decoding="async" width="50" height="83" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Mares_depth_pressure_gauge.jpg/75px-Mares_depth_pressure_gauge.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Mares_depth_pressure_gauge.jpg/100px-Mares_depth_pressure_gauge.jpg 2x" data-file-width="1548" data-file-height="2560"></a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_(without_background).jpg" title="File:Citizen Eco-Drive Diver's 200m - Diving watch (without background).jpg">Citizen Eco-Drive Diver's 200m - Diving watch (without background).jpg</a>: <a href="//commons.wikimedia.org/wiki/File:Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_(without_background).jpg" class="image"><img alt="Citizen Eco-Drive Diver's 200m - Diving watch (without background).jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg/50px-Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg" decoding="async" width="50" height="78" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg/75px-Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg/100px-Citizen_Eco-Drive_Diver%27s_200m_-_Diving_watch_%28without_background%29.jpg 2x" data-file-width="1199" data-file-height="1875"></a><br></li></ul>