Scaph Club is a small reference site for recreational scuba divers — the name comes from scaphandre, the old French word for a diving suit, and this domain has pointed at diving content for over two decades.
The heart of the site is the dive pressure and depth unit converter. Diving is one of the few hobbies where you routinely juggle five different pressure units in a single conversation: your tank gauge reads in PSI, your European buddy's reads in bar, the tables speak in feet or meters of seawater, and the physics behind it all is expressed in atmospheres. The converter translates between all of them instantly, so you can follow a dive briefing, a textbook, or a forum thread without doing arithmetic in your head.
Around the tool are a handful of guide pages that answer the questions new and returning divers actually type into a search box: what the rows and columns on a dive table mean, how fsw, msw, ATA, and bar relate to each other, how the recreational certification ladder is structured, and how to plan a dive trip to a U.S. national marine sanctuary. Every page cites primary sources — NOAA, the World Recreational Scuba Training Council, and the medical literature — and none of it replaces training. Start with how to read a dive table or jump straight to the converter above.