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Scuba Diving Advanced Questions

Updated on July 24, 2011

Scuba Diving Advanced Questions Answere

What are the two main purposes of the buoyancy control device?

A buoyancy control device provides lifesaving emergency on the surface and underwater. It gives the diver the ability to both adjust and control their overall buoyancy to remain at a constant depth as well as ascend and descend with control.

How does weight affect your buoyancy?

It is quite common for beginner scuba divers to be over-weighted. This causes more use of your buoyancy control device when you change depth. Also, if you have on a scuba diving wetsuit, when you descend, you become less buoyant. Therefore, it becomes more important to make buoyancy control adjustments to maintain proper buoyancy.

To assess your proper weight, when you are surfaced, become eye level with the surrounding water and there should not be any air in the buoyancy control device. However, this is only true with a full tank.

While you use air, the tank becomes positively buoyant. This is important to know because if you become under-weighted, you will float toward the surface. If you are unable to get close to an empty tank at the surface to check yoru buoyancy, aim to be negative buoyant, no air in your buoyancy control device and a full tank at the surface.

How many pounds of weight should you wear when you begin a dive?

If you find at the 15 ft safety stop that you need to add weight to your best, usually one to two pounds should be added to begin with. If you still find that you are under-weighted, you can surface and add more weight.

How does a wetsuit affect your buoyancy?

When you descend, a scuba diving wetsuit becomes less buoyant. This is because when it is wet, the bubbles in the suit compress due to pressure which causes the suit to lose buoyancy. If you are new to diving, you may suddenly feel as though you are under-weighted but you should wait for a bit before you decide that you want to add on additional weight because you may not even need it. Also, your wetsuit will lose buoyancy over time when your bubbles start to break down. Unfortunately, this means that it is also losing insulation and it may be time to purchase a new one.

How do you empty your buoyancy compensator inflator?

There are a few different ways that you can get the remaining air out of your buoyancy compensator.

  • Hold the buoyancy compensator and then tilt a bit to the right.

  • Press the release button while holding your inflator hose up straight.

  • Roll backwards and shake a little.

  • Pull the dump valve located on the bottom of the buoyancy compensator as you go upside down.

How does breath affect buoyancy?

You already know not to hold your breath, but you should also know that if you do, you gain a lot of buoyancy. Eventually with practice you will actually be able to descend or ascend a few feet by whether you breathe in or out.

What is the importance of divers being educated in underwater navigation?

Underwater navigation promotes a more confident diver, allowing for more effective dive planning, minimizes excess swimming which saves energy and air and helps dive buddies stay together.

What are the two main underwater navigation techniques?

Underwater navigation is split into orienteering and natural navigation techniques. In orienteering, a magnetic underwater compass is used combined with reckoning distance underwater techniques such as kick cycles, air consumption, time and actual measurement (for shorter distances).

Natural navigation involves observing phenomena such as water movement, sunlight, bottom contour and composition and noise. These methods are used by more experienced divers.

How to sand ripples help with navigation?

Sand ripples and the shore always run parallel.

What are the most common types of underwater navigation equipment used?

Popular navigation equipment includes magnetic compasses, Nav-finder, hand-held sonar and compass boards.

Why do divers wear weights?

Weights are worn by divers to counteract buoyancy of diving equipment such as aluminum diving cylinders and diving suits. They are made of lead and have a quick release so they can be dropped in case of an emergency. Weights that are dropped on accident can increase the diver's risk for decompression sickness if they are unable to control their ascent.

Advanced Scuba Diving Questions


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