Definitions are generally explained in the Training Standards of your PADI Instructor Manual. Any dive deeper than 18 metres is defined as a deep dive, not as many presume, dives below 30 metres.
Padi simplified their protocols several years ago in line with ILCOR and made it 30 compressions to 2 rescue breaths for everyone from infant to adult, 1 and 2 person rescuers too.
It's been proven that simplification increases retention for the lay first responder.
Do you want to join one of my upcoming Emergency First Response Instructor Programs?
In response to the need of a dive planner that met the needs of recreational divers Dr Raymond Rogers and his team tested and developed the PADI Recreational Dive Planner using a modal that consisted of more tissue compartments than the military style tables, it was designed to replace.
This lead to longer No Deco Limits, shorter surface intervals and longer adjusted NDL's.
Markings can vary for place to place and should not be ignored if they seem unfamiliar. The S80 on the side of a cylinder indicates the internal capacity of the tank - 80 Cubic Feet/11. litres
This is important to know when planning dives as the gas available will be the pressure multiplied by the volume; for example - 200 bar x 11.1 litres means 2,220 litres of gas available for the diver at the beginning of the dive.
Take your PADI Divemaster training with Master Divers, Koh Tao. Thailand, and enjoy a day with our equipment technicians getting to know your way around equipment care and maintenance, including cylinder care.
The Valsalva Manoeuvre it used for many purposes and in diving is often taught as the formative equalising technique for many new drivers.
When performed correctly and in a relaxed manner it remains very effective for a lot of divers but if performed in a forceful manner can cause a rupture to the membrane of the round window which can cause vertigo, tinnitus and even deafness.