A BCD is an important item for diving.
It is an essential part of controlling movement in the ocean and swimming safely.
If you are a beginner or have only just started diving, it is understandable that you may be unsure of what to choose.
So, this time we will introduce some points to consider when choosing a BCD.
Choose the model that's right for you and help you have a safe and comfortable dive.
■The role of BCD
A BCD is a device used to adjust and maintain buoyancy while diving.
It also serves to secure the tank in place, making it easier to maintain buoyancy.
Perhaps the most obvious impression of a BCD is the buoyancy adjustment.
Another feature of ensuring buoyancy is that it is useful for resting or in emergencies, such as when you need to surface from the water.
A BCD is an essential item for freely controlling your buoyancy in the ocean.
Also, BCDs used for diving are sometimes called BCs.
D stands for Devices, and since it has almost the same meaning as C, it became widely thought that it would be more natural to remove it.
This may be confusing for beginners, but BCD and BC are the same thing.
■Points to consider before choosing a BCD
Before choosing a BCD, there are a few things you should consider.
When to use it, where to use it, and the diving style.
When it comes to the time of year, your choice will depend on whether you plan to use it mainly in the summer or winter.
The location will need to be adjusted appropriately, as the environment will vary depending on the field, such as whether it is domestic or overseas.
Furthermore, the BCD you should use will vary depending on your diving style and purpose.
■Main types of BCD
Here we will introduce the main types of BCDs, so please choose the style that suits you best.
Jacket type
This type is easy to maintain neutral buoyancy and provides a sense of stability.
The advantages are that air reaches the upper body and it is easy to exhaust and intake air.
It is easy to maintain posture even when resting on the water surface, making it a versatile model.
However, if the size is not correct, adhesion will be reduced and it will be difficult to balance in the ocean.
・Shoulder buckle type
The size is easy to adjust and it works well with both wetsuits and drysuits.
Since there are many people using it, it will be easy to ask any questions or concerns you may have.
It is easy to put on and take off and has a high level of fit, making it ideal for beginners.
This is the basic BCD for diving, as the majority of rentals are of this model and many people have experience using it.
・Back float type
The unique feature of this BCD is that it only fills with air in the back area.
It makes it easier to keep the camera horizontal, making it suitable for people who take photos underwater.
Back float is a good option if you want faster and more comfortable horizontal movement.
This type is also easy to use when exploring caves, etc.
■How to choose a BCD
Choose something that fits your body well
If the BCD does not fit your body properly, it will not be effective.
If it's too big, the tank will move, and if it's too small, your body will tend to become vertical, which can make your chest feel tight, so it's important to get the size right.
If you're a beginner, try on a few in the store before making your choice.
Choose a durable model
Choosing a strong BCD will allow you to use it for a long time.
The only thing you have to adjust your buoyancy underwater is your BCD, so if something goes wrong it can be a big problem.
Durability varies depending on the manufacturer, so be sure to pay attention to the number of years it will last.
Easy to exhaust air
It is especially important that the exhaust can be discharged smoothly.
Also pay attention to the number of dump valves and make sure you can quickly drain water underwater.
A model that simplifies the operation of the exhaust air supply will prevent even beginners from panicking underwater.
The BCD is an item that acts as a buoyancy adjuster.
When choosing, pay attention to durability and whether it fits your body.
There are several models available, so choose one that suits your diving style.
Totty — BIGHOLIDAY Owner's Guide
I've lived in Miyako Island for 21 years (since 2005). I specialize in fun diving. I select Miyako Island's three major dive sites more than 150 times a year, and I've done about 20,000 dives in Miyako Island. YouTube "Totty / scuba diving" shares Miyakojima diving information with more than twelve thousand subscribers.
Since 2023, we have been among the top-ranked Marine Diving Award winners for three consecutive years.
2023 Japan Coast Guard Director-General's Award (for meritorious service in maritime rescue)
Discoverer of Miyako Island's first manta ray station in 2025
