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Some of these contents are extracted from the Internet, and some are added based on your own experience, I hope to help everyone. 
Diving license assessment entry diving is a very interesting sport, but to consider their own physical conditions, there are some people who are not suitable for diving:
1. People who have undergone middle ear surgery or corneal surgery
2. Patients with chronic emphysema or severe asthma (pneumothorax patients)
3. Those with a history of epilepsy or cramps
4. Patients with heart coronary artery disease, such as angina or a history of myocardial infarction
5. People who have been drinking for a long time.
6. No swimmer (highly recommended to learn to swim)
After confirming your physical condition, you need to obtain the opening conditions for this sport.
For the experience diving projects carried out in many places, referred to as DSD, it must be led by the instructor (in fact, many places are where the instructor is holding you) can only dive to 10M ~ 12M. OW and AOW certificates are the stepping stones to the true diving process. Most people will choose the test location in Southeast Asia, because the cost is relatively reasonable, the distance is close and the water temperature is comfortable. Leisure divers are divided into two levels. OW ---- OPEN WATER DIVER (Open Water Diver)
Ow can play in the depth of 18 meters underwater, the test content includes calm water diving skills, open water diving and cultural theory test, but the test is very convinced, you need to follow the coach to learn various skills during the day, you need to watch videos and books to learn knowledge at night This 4 ~ 5 day time is basically full.
AOW ---- ADVANCED OPEN WATER DIVER (Advanced Diver)
AOW can play in the underwater depth of 30 meters, which is the maximum depth of leisure diving. Do n’t disappoint that it is not deep enough. Most of the richest creatures are within 30 meters. In fact, the content of aow is not much, that is, 5 open water diving and The assessment of some underwater specialties is expected to take 2 to 3 days. In the final analysis, the main consideration is the adaptability to diving after ow. The work is a bit more, but the fun is much better than OW.
Tips: For these two levels, many people choose to take the test together. The overall time can be completed in about 6 ~ 8 days. The main thing is to look at the weather and personal conditions at the time of the test. If the body is found to be uncomfortable or watery during the test Fear can not be overcome, please carefully consider whether to take the test together, from a safety perspective, it is recommended not to rush to test, come to Japan. The two certificates can be tested separately.
All international diving organizations need to be approved by the China Diving Sports Association before they can enter China for diving training activities. Currently there are five international diving organizations, namely CMAS, PADI, NAUI, ADS, SSI. So far, most divers choose the diving organization as PADI. How to choose diving equipment?
Diving equipment is mainly divided into two categories, light equipment and heavy equipment light equipment: masks, snorkels, flippers, diving suits (including: jellyfish clothing, sun protection clothing), diving gloves, diving socks / diving boots, etc. 2
Light equipment (some of these are required when learning to dive)
Diving mask diving mask and swimming goggles are still very different, it not only protects the eyes but also covers the nose, swimming goggles can not dive oh, diving lens lens is special, myopic partners try to choose to take myopia Lenses, almost all instructors will tell you that wearing contact lenses while diving can cause some damage to the eyes. There are many reasons, such as water pressure, such as harmful microorganisms in the sea water environment, the surrounding skirt is generally made of silicone material, durable and not It is prone to skin allergies and is more soft and comfortable.
It is best to choose a face mask to try it in person at the dive shop. During the test, gently put the face mask on the face (without the mask strap) to inhale to see if it fits the face completely, and you need to determine whether you can pinch your nose (This is very important)
The mask chooses to recommend professional diving brands, such as V. dive \ ScubaPro \ Mares \ TUSA, etc. You can equip the mask with a mask strap. When wearing it, you can avoid hair clipping. The first time you use the mask, you need to remove the coating. , Gently use toothpaste for 20 minutes, then clean. After each use, it needs to be washed with clean water to prevent seawater corrosion, and remember not to expose to sunlight.
The front mirror needs to be defogged every time it is launched. The coach will teach you to use demisting spray, toothpaste and saliva. . . . Follow-up other methods please develop by yourself. . . .
Many snorkel divers skip the snorkel prop directly. In fact, this prop is still very needed. When you float on the water, the snorkel is very useful. Many experienced divers before diving in a new place , Will snorkel on the water to see the terrain under the water to facilitate diving plans. You can also play snorkeling for a while at noon. The snorkel is divided into three types: fully dry snorkel, semi-dry snorkel and wet snorkel.
Fully dry breathing tube: A float valve is designed at the air inlet, which is a proprietary component of the dry tube, but when the air inlet of the breathing tube is below the water surface, the float valve will close the air inlet to prevent sea water from filling the pipe .
Semi-dry snorkel: There is no float valve, the other is the same as the full-dry type, which can prevent broken waves from entering the tube, but if it is completely submerged, it will also enter the water. Wet breathing tube: without any valve, straight-through, cheap price.
Flippers are distinguished by appearance: they can be divided into two types: Paddle Fin and Split Fin. . s7 Q * According to the adjustment method: it is divided into two types: Open Heel and Full Foot Pocket.
The choice of fins depends on body type, diving environment, physical strength and kicking method. It is still recommended to try. Everyone's experience of fins is very different. Remarks: Jetfin is not recommended for general novices Diving clothing Diving clothes are usually divided into two main types, jellyfish pants and wet clothes, and of course dry clothes, but that is limited to cold diving environments.
Jellyfish clothing:
In many warm waters in Southeast Asia, jellyfish clothes can be worn. It is recommended not to go into the water without being hot. Many aquatic organisms can cause skin irritation and allergies. Jellyfish clothing has many functions, such as avoiding sunburn, body protection, and avoiding stinging by marine organisms.
Wet clothes:
We usually wear wet clothes in leisure diving, the thickness is 2mm ~ 7mm, it is more difficult to wear, but do not choose too large size, does not play a role in keeping warm, many beautiful brands can choose, you can go to Taobao search, conventional In addition to the brand, there are many expensive brands, you can also choose to customize, depending on your preferences. Recommend hooded vest, practical and beautiful.
Drying:
The material is mostly made of foamed rubber, which does not completely isolate the water from the body, but the slow movement of the water in the winter clothes to extend the body's insulation time, not much explanation here, because generally leisure diving You ca n’t use it, and the price of dry clothes is very expensive. Tips: According to the different water temperature in the diving area, you need to choose wet clothes of different thickness, such as 1mm or 1.5mm at about 30 degrees; choose 3mm at 24 ~ 28 degrees, and below 24 degrees. Choose 5mm or 7mm, of course, it will be slightly different according to the different cold resistance of each person. In diving in Southeast Asia, in most cases 1.5mm thickness or even jellyfish clothing is sufficient.
In addition, I would like to introduce a piece of clothing that I personally think is very necessary ---- Sunscreen (skin clothing):
In diving resorts, the sun is generally very strong. If you do n’t wear jellyfish clothing, you can protect your body from sunburn by sun protection clothing. Sun protection clothing is also called skin clothing. You can buy skin clothing of various outdoor brands to wear on board. , Pay attention to the sun protection index when buying. Diving gloves:
It has the function of keeping warm and protecting. However, in many diving areas, in order to protect the environment (to avoid damage to underwater creatures), divers are not allowed to bring diving gloves to the sea (please pay attention to this point)
Diving socks & diving boots:
Individuals are accustomed to wearing diving boots, but the fins that can be used in boots are only adjustable, because sometimes shore diving needs to walk on long reefs, boots can effectively avoid scratches, and some places are not allowed to wear in order to protect coral reefs. Boots, but diving socks are fine. The rubber flippers can be worn in diving socks or barefoot. Diving Computer
The dive computer is also called a dive watch, but it does not mean that you can not look at the dive watch with a dive computer. The dive computer is an advanced product that provides you with effective information and attention in various diving situations, but it does not Not all dive watches on the market can be called dive computers, so if you buy a dive watch for diving, it is best to choose a professional brand of dive computers. When you buy, remember to make sure you change the settings in the battery calibration table. Don't just buy cheaply. Flashlight:
In fact, it is recommended that the diving partners prepare a flashlight, which can be used as lighting during night dives, and can also be used to find small creatures in the reef during the day. It is very interesting, but not every flashlight is suitable for underwater photography, so When selecting, you should consider the status of the flashlight.
Underwater photography:
Underwater photography is actually not recommended for novices to try, because in addition to the higher technical requirements for photography, the technical requirements for diving are also very high. Underwater shooting can simply write a big paper, which is not explained here one by one, and the water photography equipment also ranges from thousands to hundreds of thousands. To shoot beautiful works, it is recommended to improve your diving first. The ability begins. The entry-level machine recommends TG4 and RX100, the lamp is also a very important part, the usage of flash and fill light is also very different, the price of the lamp is also extremely expensive, it is recommended to gradually. Starting from macro to enter the world of underwater photography. Worth the master's work, appreciate it, pure admiration.
Useful props:
Look at the title to know the pull, these small props are really useful, prop 1: elephant pull, for this artifact I really tirelessly recommend to the friends, because the water, playing elephant pull can let the boat see your water position to avoid being propeller Hurt, playing elephant pull is a very good habit of safe diving. It is recommended to have one. As for how to use it, how big it is to buy, please spend it yourself. Prop 2: Tinker stick, which is a small metal stick that is about the size of chopsticks. It can be used to knock gas cylinders in emergencies, and can also be used to fiddle with uncertain environments underwater. Prop 3: Lingling, a small iron jar, there will be a very clear voice shaking, used to notify the friends around. Prop 4: Flow hooks are very useful in the big flow area. Fix yourself on the reef with the flow hook to prevent yourself from being blown away by the flow, and it will not cost too much effort because of the top flow. For other small props, it is recommended to take a good look at the post. Here is a brief introduction. There are too many varieties of usage, and I will not explain them one by one. . . . . .
The easiest way is to search on a treasure and search for it ïŠ Heavy equipment (many people choose to rent at a dive shop)
Breathing regulator, buoyancy controller (BCD) or flyback, gas cylinder, counterweight, etc.!
Although diving equipment (or resorts) are generally available for rent, they are based on: 1. health issues, 2. fit or not, 3. usage habits, 4. underwater comfort and safety, and other economic reasons When allowed, purchasing personal light equipment will make diving safer and more fun. As a rookie preparing for the test, I personally recommend that you prepare some light equipment. These professional-level equipment should be considered after you have obtained the diving certificate. Come, and finally give a brief introduction to the common diving equipment brands on the market:
Scubapro:
American brand. This brand is not the most professional, but it is the world's number one sales. It is also a dedicated diving brand for the US Navy. This brand has designated OEM manufacturers around the world, making different products for people of different regions, and it is for this reason that our flat-nose Asians still feel comfortable with Scubapro masks.
Aqua-Lung:
The inventor of the scuba can be said to be the top and most professional brand of the scuba system. There are eight sub-brands under it, each with a professional product category, such as Sea Quest specializing in BC buoyancy vests, Deep See specializing in masks and snorkels, etc.
Poseidon:
Sweden's famous brands, in addition to Electrolux, IKEA, Ericsson, Poseidon is also very famous in the diving world. The origin of the brand name is well understood: Poseidon-Poseidon. Poseidon's products are also designated by the Royal Navy as a diving equipment brand. , P8 B & W. w- R9 C9 J, n
Tusa:
Japanese brand. The advantage is that in addition to being good-looking or good-looking. Have you ever seen a pure white wetsuit? Have you ever seen pink-blue flippers? Only in Tusa's product catalog you can find such bright colors
Mares:
Italian brand. Italy is a country where there is no shortage of famous brands in any field, and the Mares brand is basically as well known in the diving industry as Ferrari. From the brand point of view, Mares is not dedicated to high-end products, but mostly mid-range products, so its practicality is extremely prominent. This is the introduction here. As a primer, you should already have a preliminary understanding. I hope that all these help you will be tested. Diving is a very dangerous, but very interesting activity. Believe me, the earth has another 70 % Of the world is very magical, as long as everyone can memorize the instructor's teaching strictly, don't be ashamed to ask when learning, be responsible for your own life and Batty's life, every diving will be a wonderful experience.
Diving? You must know!
In the past few years, domestic divers have grown at a geometric rate. Watching the friends around them brushing the blue ocean, more and more young people have become curious about the other 70% of the earth and choose to squeeze out the holiday. Going to test the diver's license, for those of you who long for the ocean, you not only need to prepare money and time, but also many things you must know!