Basic week_05_and_06 Indirect - Tables Fall 2010

Planningyourdive findingyourlettergroup

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Unformatted text preview: es. Use the next greater dive time if dive was cold or strenuous. Review on Dive Table Rules Review on Dive Table Rules What have you learned so far? What is the maximum ascent rate according to NAUI dive tables? What is the minimum amount of time needed between two dives and the recommended amount of time? In what order should dives be made according to depth? Dive Table Organization Dive Table Organization The NAUI dive tables are composed of three tables. Table 1: End­of­Dive Letter Group. Examples: Dive Table Organization Dive Table Organization The NAUI dive tables are composed of three tables. Table 2: Surface Interval Time (SIT) Table. Examples: Dive Table Organization Dive Table Organization The NAUI dive tables are composed of three tables. Table 3: Repetitive Dive Timetable. Examples: Dive Planning Worksheet Dive Planning Worksheet It helps to use a worksheet to record information when using Dive Tables. Planning your dive. Finding your letter group. Recording your SIT and finding your new group letter. Planning your repetitive dive. Recording your repetitive dive. Using Dive Tables Using Dive Tables What is the diver’s ending letter group? Dive 1: Max. Depth: 66 feet (20 meters) ADT: 36 minutes. SIT: 1 hour 50 minutes. Dive 2: Max. Depth: 46 feet (14 meters) ADT: 32 minutes. SIT: 1 hour 35 minutes. Dive 3: Max. Depth: 40 feet (12 meters) ADT: 43 minutes. H 66 fsw 1:50 E I 46 fsw 1:35 F J 40 fsw 0 36 min. 38 min. 32 min. 61 min. 43 min. 36 min. 70 min. 104 min. Maximizing Underwater Time Maximizing Underwater Time You can maximize your dive by: Planning your surface interval “Deeper dive first” means less required surface interval Limiting your depth Limiting your dive time Find the minimum surface interval Find the minimum surface interval Dive 1: 80 feet (24 meters) ADT: 25 minutes Dive 2: 60 feet (18 meters) ADT: 25 minutes What is the minimum required surface interval time? What is the recommended SIT? F 80 fsw 0:46 E I 60 fsw 0 25 min. 30 min. 25 min. 25 min. 55 min. Special Rules Special Rules There are a few special procedures to handle special situations. Decompression diving. Planned decompression diving is an advanced level skill. Recreational divers should avoid deco dives. Omitted decompression. Cold or strenuous dives. Flying after diving. Altitude diving. Dive Computers Dive Computers The easiest way to determine how long you can dive is to use a dive computer. Remember: Both dive tables and dive computers use theoretical models. You, however, are a carbon­ based life form. Tables and computers don’t get bent—Divers get bent. The great advantage of a computer is extended dive times. A dive computer continually samples time and depth (pressure) and recalculates your nitrogen loading So, a computer gives you “credit” for the shallow parts of your dive. No “square profile” as tables require. Dive Computers Dive Computers Displayed information Initialization Decompression mode Planning repetitive dives Current depth Current dive time Maximum depth Time remaining at depth Ascent rate indicator Scrolling or dive planning Altitude diving Flying after diving indicator Logging your dives Downloading to a computer logbook Dive Computers Dive Computers Whoops! A dive computer is an electronic device and can fail. What if the screen goes blank? We hope you’ve been checking your display regularly! End the dive normally. Follow the manufacturer’s recommendations. Review of Decompression Review of Decompression Nitrogen and Diving. Dive Table Overview. Dive Table Organization. Dive Planning Worksheet. Maximizing Your Underwater Time. Special Rules. Sample Problems. Using Dive Computers. This Week in the Pool Normal lab times apply from now on. Don’t gforget to sign in. “If you don’t sign in, you are not there.” Be on time. When you arrive at the pool: When you arrive at the pool: Sign in on the roster. Get your equipment from the Dive Locker Scuba gear: BC, regulator, cylinder Mask/snorkel and fins Wetsuit, belt, two weights Begin assembling scuba unit. We’ll monitor your assembly....
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