2. Ear pressure balance: Generally divers will feel ear pain when diving to a depth of three meters, which is caused by the increasing water pressure. If the water depth is an interval every10m, the maximum pressure changes within the first10m. The general ear pressure balance method is to hold the nose from the top of the mask to block the nostrils, and then blow hard to let the air enter the ear canal. As for the old diver, he can balance the ear pressure by swallowing saliva or swinging his chin from side to side. It is easier to keep your head up when balancing ear pressure. Every time you dive to a certain depth, you should immediately balance the ear pressure, especially in shallow water.
3. It is impossible to have a conversation in the water, and information can only be transmitted by other means, among which the world-recognized diving gesture is one. Mastering and expressing diving posture skillfully is the premise to ensure diving safety.
For an object placed in water, the buoyancy it receives is equal to the weight of the water it displaces. If the weight of water displaced by an object in water is greater than the weight of the object itself, the object will float on the water, which is called positive buoyancy, and vice versa. If the weight of the water discharged by an object is equal to the weight of the object itself, the object will be suspended in the water to achieve neutral buoyancy. When diving, it is very important to learn to control the buoyancy on the surface and bottom. For example, when resting on the water, positive buoyancy can save physical strength, while when underwater, it is necessary to maintain neutral buoyancy most of the time in order to swim freely in the water and maintain good visibility. Divers can adjust buoyancy by counterweight, buoyancy control device (BC) and breathing depth.
5. Diving tips: Doing a neutral buoyancy control, relaxing and elegant action can reduce the air consumption caused by excessive exercise; Breathing gently can make every part of the air work without wasting; Proper use of flippers can reduce the consumption of precious air due to the resistance to water; Quit smoking because smokers' lungs need more air; Avoid hypothermia, thus avoiding the need for a lot of air to maintain body temperature.
Six, the first diving tips:
1, nervousness is the primary reason why you can't succeed in the first dive, because nervousness makes your movements stiff and slow, your agility drops, you are short of breath, and you may forget to breathe when you are highly nervous. Listening to the guidance of professional coaches and trusting them is the best and most effective way to eliminate nervousness.
2. Because you don't use the regulator for breathing experience, you may not be used to it at first. You should get used to practicing breathing with a regulator on shore.
3. Balancing the ear pressure after diving is the most important procedure, but most first-time divers often forget to balance the ear pressure or fail to do it properly, resulting in eardrum pain and unable to continue diving. Before diving, you must form a sense of balancing ear pressure in your brain, and then do ear pressure every other meter before diving, otherwise it will be too late to wait until your ear hurts.
4. Some people mistakenly put the regulator in their mouth, which will cause the regulator water to flow into their mouth instead of discharging the water in the regulator, thus causing fear. In fact, as long as you can easily bite the tray with your teeth and wrap your lips around the mouth of the regulator, water will not enter.
You should learn to drain the mirror: first, try to put your face up, then press the upper edge of the mirror with your hand and exhaust with your nose. According to the pressure principle, you can drain the water under the mirror.
Seven, diving organization:
As diving became more and more popular, many diving organizations came into being. At present, there are hundreds of diving organizations in the world. Due to different business strategies and methods, its popularity, popularity and degree of internationalization are also different. The following are some well-known international diving organizations. At present, the main diving organizations in the world include the World Diving Federation (CAMS), the International Diving Coaches Association (NAUI) and the Professional Diving Coaches Association (PADI).
[Leisure diving]
PADI (professional association of diving instructors)
Founded in 1966, its education system is popular in all regions of the world. PADI focuses on the development and design of scuba diving training courses and teaching materials, and maintains and records the information of divers at each level in detail, hoping to establish a diver qualification certification system with global credibility.
International Association of Water Coaches
Founded in 1960, its education system is popular in all regions of the world. NAUI is composed of many members, including: diving master, teaching assistant, snorkeling coach and diving coach. NAUI stands for "training quality", "coaching ability" and "implementing diving safety through education".
CMAS (world water sports alliance)
Founded in 1958, its education system is popular in all regions of the world; Most diving organizations cross-examine the qualifications and grades of divers with CMAS. A few diving organizations are members of CMAS "Technical Committee". CMAS has set up three committees: the "Sports Committee" is responsible for coordinating the member countries and formulating international competition rules for fishing, web swimming, water polo and water polo hockey; The "Technical Committee" is responsible for formulating "standardized" scuba diving training rules and international certification system, and also for promoting and improving the research and development of high-tech materials and diving equipment related to scuba diving safety; The "Scientific Committee" provides funds to carry out the research plan of "diving technology".
YMCA
Founded in 1959, its education system is popular in North America, Central America, Southern Europe and Northeast Asia. According to CNCA (National Committee for the Promotion of Underwater Sports) "Guide to the Development of Underwater Respirators", a high-standard safety diving training course was developed, which is called "Y-SCUBA" for short. 1990, YMCA provided a full scholarship for the diving instructor course at Mount seapaul State University in Indiana, USA.
International Union of Diving Schools
Founded in 1980, its education system is popular in Japan, China, Taiwan Province Province, Palau and other Pacific island arc areas. Its purpose is to instill correct diving knowledge and skills and the concept of safe diving. This is a school specializing in diving education.
BSAC (British Diving Association)
Founded in 1953, its education system is popular in Commonwealth countries, Europe and Northeast Asia. Its nature is similar to that of a consortium, and the profits from its organization and operation must be used for the research and development of diving safety. During the period of 1954- 1955, BSAC developed rapidly in Britain and became the authoritative organization for water sports policy guidance in Britain. And "BSAC diving training school system" was established in 1976. "BSAC Diving School" is an independent commercial organization, which is authorized by BSAC to train and grant BSAC diving qualification certification.
[technical diving]
Professional scuba diving series
Founded in 1987, its education system is popular in North America. PSA applies the knowledge and experience derived from "scuba diving" technology, formulates strict safety standards, provides appropriate technical diving training, and extends the diving field of leisure divers in the safest way.
Technical Divers International Organization
Founded in 1994, its education system is popular in North America, South America, Europe, Central Asia, Northeast Asia and the Middle East. The core managers of TDI have more than 20 years of technical diving experience: TDI has developed a wide range of technical diving training courses, used many supporting teaching materials, and provided education and training in technical diving fields such as nitrogen oxides, mixed gases and deep air.
International Association of Nitrogen and Oxygen Mixed Divers and Technical Divers
Founded in 1985, its education system is popular in North America, Britain, Europe, Africa and Asia. IANTD formulates high-quality "standards and procedures" to standardize the education and training of EANx. 1992, IANTD began to compile systematic technical diving related teaching materials, including: diver training manuals at all levels and various technical diving reference tables (PO2, CNS/OUT%, EAD, heilium, EANx).
ANDI (American organization of nitrogen and oxygen divers)
Founded in 1989, its education system is popular in North America, Europe, the Middle East and Northeast Asia. ANDI, formerly known as "American Nitrogen-Oxygen Mixer Divers Association", aims to promote the standard formulation and education and training of "hyperoxia" breathing gas, so that divers in the leisure diving field can use it safely under the correct guidance of technical diving instructors. It has been developed for more than 40 years. After rigorous testing by the US Navy and NOAA, the EANx(NITROX) diving breathing gas for diving activities has been developed. ANDI has formulated the preparation procedure and inspection standard of EANx gas for breathing, and registered the trademark of "SafeAirTM". The EANx breathing gas produced according to ANDI specification is called "safe air".
An authoritative diving organization
NAUI: International Association of Diving Coaches, founded in 1960, is one of the most authoritative diving organizations in the world;
PADI: Professional diving instructors association, which has great influence in western countries and is one of the largest diving organizations in the world;
CMAS: International Underwater Sports Federation, which has more than 80 national members in the world and is recognized by the International Olympic Committee;
ADS: International diving school alliance, founded in Japan, has great influence in East Asia and Southeast Asia;
CUA: China diving association
By June 5438+ 10, 2008, the "Yongtai" inflatable rubber fender produced by Qingdao Yongtai Airbag Fender Co., Ltd. has been exported to Singapore, Saudi Arabia, Russia, Spain and Greece. It has been adopted by more than 30 foreign shipowners and won favorable comments. The quality of this product has always been in line with Yokohama and
И o17357 "Ships and marine technology. High pressure floating inflatable rubber fender is an international quality standard. The products have passed the quality certification of CCS DNV Classification Society. Stable quality, perfect service and limited price will definitely satisfy every customer.