• The ability to block off your nose to help equalize the pressure in your ears. • A double featheredge seal to help the mask fit to your face. There are many optional features you might want to consider when you select your mask. Some popular optional features include: • Side windows to provide a wider field of vision. • A purge valve to help clear water from the mask. • A low-volume mask that fits closely to your face to give you a wider angle of vision. It is also easier to clear of water. • Prescription lenses. New mask lenses are covered with a thin film of lubricant. You can use mask scrub to remove this lubricant by using the following procedure: 1. Put a little mask scrub product (available at most dive stores) on the inside of each lens of the mask. 2. Rub the mask scrub over the entire lens with your fingers or a soft, wet cloth. 3. Rinse well with fresh water. Washing the lens with mask scrub helps keep the lens from fogging, which occurs when condensation forms on the inside of the lens. Each time you don your mask for diving, you will need to prepare it so that it will not fog because of the temperature difference inside the mask compared to the surrounding water. The most common way to prevent fogging used to be to spit in the mask, rub the saliva on the lens, and then rinse the mask. A better alternative is to use commercially available anti-fog sprays, drops, or creams. Snorkels Have you ever noticed that you can lie face down on the surface of the water and float completely motionless? It’s easy, and most people can do it. However, every time you need to breathe, you must lift your head out of the water and that takes exertion and gets tiring. A snorkel is the answer to this problem. (figure 2-3). A snorkel enables you to breathe normally while you watch the beauty beneath you. Even little kids can easily enjoy the activity. The snorkel helps you conserve energy – and the air in your scuba cylinder – any time you are swimming on the surface (figure 2-4). There are many different features available with snorkels. The basic snorkel is a “J” shaped tube with a mouthpiece at the curved end (figure 2-5). Other features that can be added to the basic snorkel include: • Flexible hosing to enable the snorkel to fit comfortably in your mouth. • A purge valve to allow water to drain out of the bottom of the tube. • A swivel mouthpiece so you can adjust the mouthpiece in your mouth and swivel it out of the way when you switch to a regulator. NAUI Scuba Diver 16 Diving Equipment FIGURE 2-3. DIFFERENT TYPES OF SNORKELS. FIGURE 2-4. A SNORKEL ENABLES YOU TO BREATHE AS YOU ENJOY THE BEAUTY BENEATH YOU.
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