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It's curious, among divers, this need to make sentences with the handss!Paraphrase freely inspired by the dialogues of Jacques Audiard inTontons Flingueurs.
In the world of silence (which is the world without speech, not the world without noise), communication between divers is an element of safety essential. The relevance of the signs takes precedence over their number.
Simple to be effective: safety first
* Signs standardized by CMAS (Congress of Barcelona 1960 and Singapore 1999)
OK, EVERYTHING IS OK
This sign is both a question "Are you okay?" and a response “Ok, everything is fine”.
When your instructor or your dive guide gives you this sign, you must answer either "Ok, everything is fine" or "It's not fine" by possibly pointing out what is wrong. For example by showing your ear, if you have a problem balancing the pressures on the descent. A non-answer to the question "Is everything okay?" is equivalent to “It's not going well” and induces an action from the instructor or the dive guide.
OK, EVERYTHING IS OK: ON YOUR ARRIVAL ON THE SURFACE
Par défaut, lors de l’arrivée en surface, l’absence de signe “Ok, tout va bien” conduit à déclencher une procédure d’urgence.
IT'S NOT OK
Sign "It's not okayto do as soon as something important goes wrong.
Depending on the context, a team member, the dive guide or the diving instructor will immediately assist you.
Most often this will end the dive.
ENSURE AIR RESERVES
Throughout your dive, you should check your pressure gauge for available air reserves (however, avoid doing this too often unnecessarily).
From time to time, your instructor may ask you "Show me your manometer".
Then just turn the dial of your manometer (or your dive computer if it incorporates air management) towards him so that he can read the remaining pressure.
Wanting to indicate the pressure by diving signs symbolizing a number is useless, a source of confusion and a waste of time.
In all cases, indicate100 bar, half pressure», as soon as the needle of your pressure gauge indicates 100 bars.
In order to avoid any complications, do not take into account the initial pressure of the bottle (180, 200 or 220 bars) to calculate the half-pressure, make the sign "half-pressure" from 100 bars.
Generally, your instructor or your dive guide will take this into account and ensure that you are out of the water with 50 bars in reserve. If this is not the case, then remember to indicate "I'm on reserve» as soon as your pressure gauge indicates 50 bars (red area of the dial).
Following these instructions will prevent you from being confronted with the "air failure», always stressful although managing perfectly if you stay close to your dive guide throughout the dive: this one will then make you breathe on his emergency regulator and will end the dive for the whole dive .
AVOID FALLING OUT OF BREATH
To avoid getting out of breath, keep in good physical shape, avoid heavy meals before diving and do not dive if you are tired (long trip, lack of sleep, etc.).
During the dive, avoid efforts that are too great for you and, in any case, get into the habit of practicing deep voluntary exhalations as soon as you make an effort, even a slight one.
If the preventive measures are insufficient, at the first signs (feeling of slight suffocation, inability to hold a “control pane”), give the sign “I am out of breath” to your dive guide. He will ask you to stop all effort, calm down and force the exhalation.
This usually signals the “end of the dive”.
To avoid getting cold, eat properly before diving, cover up if necessary (if you are cold on the surface it can only get worse underwater) and wear a fitted and sufficiently thick wetsuit.
If that's not enough, make the "I'm cold" sign right away. This will end the dive for the entire dive.
Des informations du type “J’ai un peu froid”, “J’ai moyennement froid”, ne sont d’aucun intérêt. C’est un signe binaire, lorsque vous le faite, c’est que vous avez vraiment froid et qu’il faut mettre fin à la plongée.
A little history …
The need to have standardized signs became apparent very early on, from the symposium of March 8, 1958 in Cannes (report published in October).
Statement by Pr. Jacques Chouteau, President of the first international colloquium on the teaching of diving (1958)
En 1960, lors du congrès de la CMAS à Barcelone, ces signes inspirèrent grandement ceux adoptés par la CMAS. Yves Normand réalisa les planches officielles qui constituèrent la première publication de signes de plongées normalisés sur le plan mondial. Il furent complétés en 1999 lors du congrès de Singapour (signe “mi-pression, 100 bars”).
The signs today
The tendency towards inflation in the number of diving signs, already present when they were officially created in 1958, is still debated. Some books publish dozens or even hundreds of diving signs. This seems to us to pervert the logic of diving signs, which must remain essentially focused on safety and therefore be frank, unambiguous and few in number for perfect memorization.