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NASE ACADEMIC TEACHING ASSIGNMENTS Flashcards

1
Q

01 Dive Table Terminology - Single Dive

A

Any dive made at least 12 hours after a previous dive.

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2
Q

01 Dive Table Terminology - Repetitive Dive

A

Any dive made within 12 hours of a prior dive. You must account for residual nitrogen when making repetitive dives.

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3
Q

01 Dive Table Terminology - Actual Bottom Time (ABT)

A

Time spent under water. Begins when you leave the surface; ends when you return.

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4
Q

01 Dive Table Terminology - Repetitive Group Designator

Letter Group

A

Equates the overall level of excess nitrogen left in your body from previous dives to a letter of the alphabet.

  1. The more nitrogen, the higher the letter.
  2. Increases with depth and time
  3. Decreases the longer you remain out of the water
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5
Q

01 Dive Table Terminology - Residual Nitrogen Time (RNT)

A

A way of equating your letter group to the number of minutes it would take at a particular depth to absorb an equivalent amount of nitrogen on a single dive.

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6
Q

01 Dive Table Terminology - Adjusted No-Decompression Limit (ANDL)

A

The time you can spend at a particular depth,allowing for residual nitrogen from prior dives, without exceeding the no-decompression limit (NDL) for that depth.

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7
Q

01 Dive Table Terminology - Total Bottom Time (TBT)

A

The sum of the ABT and RNT. TBT must not exceed the NDL for your maximum depth.

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8
Q

02 Dive Table Rules 1 - 4

NASE Recreational Dive Tables are based on US Navy Tables, and further modified based on Doppler bubble research conducted by the US Navy.

A
  1. Make no more than one single dive, followed by two repetitive dives in any 24-hour period.
  2. To maximize bottom time and safety margins, make each dive in a series to the same or a shallower depth than the previous dive (i.e., deepest dives first.
  3. If you exceed any dive table depth or time value, round to the next greater depth or time shown.
    Ascend at a rate not greater than 10 m/30 ft per minute.
  4. End every dive with a precautionary decompression (safety) stop at 3-6 m.10-20 ft from three to 5 minutes.
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9
Q

02 Dive Table Rules 5 - 8

A
  1. If you exceed an NDL by no more than 5 minutes: * Remain five minutes at 3-6 m/10-20 ft, and
    * Wait at least 12 hours before diving again.
  2. If you exceed an NDL by more than 5 minutes: * * * Stop for 15 minutes at 3-6 m/10-20 ft, and
    * Wait at least 12 hours before diving again.
  3. Wait at least 12 hours after single dives before flying or driving to altitude.
  4. Wait at least 24 hours after repetitive dives or multiple days of of diving before flying or driving to altitude.
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10
Q

02 Dive Table Rules - Learning Objective & Resources

A

LO - By the end of this presentation, your students must be able to correctly answer the following Question.

“What specific rules apply to using the NASE Recreational Dive Tables/”

Resources - NASE Recreational Dive Tables and the Standard Power Point.

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11
Q

01 Dive Table Terminology Learning Objective & Resources

A

LO - By the end of this presentation, your students must be able to correctly answer the following Question.

“What do the terms single, dive, repetitive dive, letter group, ADT, RNT, TBE and ANDL mean?”

Resources - NASE Recreational Dive Tables and the Standard Power Point.

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12
Q

03 Find NDLS, End-of-Dive Letter Groups - Learning Objective & Resources.

A

LO - By the end of this presentation, your students must be able to correctly answer the following Question.

“How do you use NSDE Recreational Dive Table to find both single-dive NDL and end of dive Repetitive Group Designators (Letter Groups)

Resources - NASE Recreational Dive Tables and the Standard Power Point.

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13
Q

04 Finding End-of-Surface Interval (SI) Letter Groups

A

EQs of Learning Objective

  1. What is the minimum amount of time that must pass to qualify as a surface Interval (SI)
  2. How do you use the NASE Recreational Dive Tables to find the Repetitive Designator (letter group) at the end of a SI?
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14
Q

05 Finding Residual Nitrogen Times and Adjusted No-Decompression Limits - Learning Objective

A

LO - “How do you use the N-RDT tp find both RNTs and ADNLS”

RNT is the top number
ADNL is the bottom number

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15
Q

06 Completing the Circle for Using N-RDTs

Learning Objective

A

LO “How do yo determine the end-of-dive group for repetitive dives?”

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16
Q

07 Determining Surface Air Comsumption (SAC) Rate

Learning Objective

A

Deep Diver Specialty

“Given values for median depth, gas used and cylinder size, how do you determine the equivalent SAC rate in either liters/minute or cubic feet/minute?

17
Q

07 Determining SAC - PSI/Minute Rate Formula

A

(PSI Used / minutes) / Depth in ATA

Example (400 psi/10min) / 2.0 ATA = SAC Rate of 20 psi/min

18
Q

07 Determining SAC - Formula for Determning SAC Cubic in Ft/Minute Rate

A

(tank cubic ft / Pressure)*SAC in PSI = SAC Cubic Ft/min

Example - a diver with SAC of 20 psi/min using 80CFt tank has a SAC of how many Cft/min?

(78.8Cft/3,000psi)*25 = 0.52 Cft/min

100 CFt w/3500 psi used by diver with SAC of 25 psi/min
(100/3500) * 25 = 0.71 CFt/min SAC rate

19
Q

08 Using SAC Rates - Learning Objective

A

Deep Diver Specialty
“Given a diver’s personal SAC rate and the size of their cylinder(s), how do you determine how much gas in (bar or psi) will they need to remain at a particular depth for a specific number of minutes

20
Q

08 Using SAC Rates - Process and Formulas

A

Step 1 - Convert SAC in CFt to SAC in PSI
Formula SAC in CFt / (Tank CFt/Pressure) = SAC in PSI
Example: diver w/SAC 0.71 Dft/min will consume how many psi/min if diving a hp 100?
0.71/(100Cft/3,500psi) = 25 psi/min SAC

Step 2 - Determine the PSI Needed
Formula is (SAC in psi) * ATA = Time
Example: Diver with SAC of 25 psi/minute will need 1,125 psi to remain 15 minutes a 86 ft
25 * 3.0 * 15 = 1,125 psi

21
Q

09 Using a Formula to Calculate ATA - Learning Obj

A

How can you use a mathematical formula to determine Atmospheric Absolute (ATA) biven depth in meteres or feet?

Metric ATA = Actual Depth + 10m / 10 meters
Imperial ATA = Actual Depth + 33 feet / 33 feet

Resources 1. Page 83 of NASE Nitrox Diver Manual
2. Std PowerPoint

22
Q
  1. Using a Formula to Calculate PO2s
A

Master Scuba or Entry Level Tech Diver Training

LO “How can you a mathematical formula to detertime Partial Pressure of Pxygen (PO2) given the Fraction of Oxygen FO2 of the gas mixture and maximum depth of the dive?

PO2 = Depth in ATA * FO2

Resources 1. Page 84 of NASE Nitrox Diver Manual
2. Std PowerPoint

23
Q
  1. Using a Formula to Calculate MODs
A

Master Scuba or Entry Level Tech Diver Training

LO “How can you a mathematical formula to determine Maximum Operating Depth (MOD) given a Limiting Partial Pressure of Oxygen (FO2) value and the Fraction of Oxygen (FO2) of the gas being used ?

Metric MOD = [10* (PO2/FO2)] -10
Imperial MOD = [33* (PO2/FO2)] -33

Determine MOD for PO2 1.2ATA FO2 16%
{33*(1.2/.16)-33 or (33 * 7.3)-33 or 247.5 - 33 = 214.5

Resources 1. Page 85 of NASE Nitrox Diver Manual
2. Std powerpoint

24
Q
  1. Using a Formula to Calculate EADs
A

Master Scuba or Entry Level Tech Diver Training

LO “How can you a mathematical formula to determine Equivalent Air Depth (EADs) give the FO2 of the gas mixture and the maximum depth of the dive?

EAD = [(1-PO2)*(Actual Depth + 10m-33ft)/Ambient Surface FN2] - 10m/33ft

MOD of a dive to 165ft using PO2 23% (FN2=77%)
MOD = [(1-0.23)(165+33)/0.79] - 33ft
[0.77198/0.79)-33 or 160 ft

Resources 1. Page 85 of NASE Nitrox Diver Manual
2. Std powerpoint

25
Q

13 Preforming CNS Clock Calculations

A

Nitrox Diver II or Entry Level Tech Diver

LO “How do you use the NASE Oxygen Exposure Time Limit Table to preform a series of “CNS Clock’ calculations?

R1. Page 68-71 of NASE Nitrox Diver Manual
R2. NASE EAD/CNS Table
R3. ITP Candidate Resource Disk has PNGs that can be inserted into PowerPoint Presentations

26
Q
  1. Oxygen Analyzer Features
A

Nitrox Diver 1
LO What features do oxygen analyzers typically have in common?

R1. Pages 44-47 of the NASE Nitrox Diver Manual
R2. Pages 9-10 of the NASE Nitrox Diver Instructor Guide

27
Q
  1. Running a Reciprocal Compass Course
A

LO1 What does the term reciprocal compass course mean?
LO2 What are at least two ways divers can run a reciprocal compass course?

You can reach a wreck by swimming on a heading of 110 degrees from the boat ramp. What reciprocal heading will you need to swim to return to your starting point and what are at least two ways you can do this with most modern compasses?

28
Q
  1. Temperature Changes Due to Pressure
A

Master Scuba Diver

LO How can you use a mathematical formula to determine the precise change in pressure in a rigid container that would result fro a change in temperature (and visa versa).

The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas’s absolute temperature.

(P1/P2) = (T1/T2) or P1T2 = P2T1 or P2 = P1*T2/T1)
P is the pressure of the gas
T is the temperature of the gas in kelvin degrees
Absolute Zero = -460 degrees F & -273 degrees Celsius

What is the pressure for a tank with 3,000 psi@ 80 D-F if it is heated to 100 D-F sitting in you car?
P2 - 3,000(100+460)/(80+460) or 3,000560/540 = 3,111psi

R1 NASE Master Diver Manual
https://en.wikipedia.org/wiki/Gay%E2%80%93Lussac_law

29
Q
  1. Determining Surface Volume for Lifting
A

Master Scuba Diver

LO Given an object’s weight and displacement, and the median depth of a lift bag attached to the object, how much gas must be pumped from the surface to the lift bag to make the object neutrally buoyant for lifting?

Basic Formula - Determine
(A) Calculate Vol of Water to Displace to = weight of object
* Fresh density is 62.4 pounds per cubic foot (lbs/cf).
* Salt water density is 64 lbs/cf. Air density is 0.08 lbs/cf.
(B) Calculate Vol of Air (cf) at Depth to = Needed Vol of water
V2 = P2*V1/P1 (Using ATAs)

R1 www.divebuddy.com/calculator/liftbag.aspx
R2 www.protechscuba.com/tmp/search.html

30
Q

19 Conduct Jackstay Searches

A

Search and Rescue Specility
LO What are at least two different way divers can conduct a Jackstay search under water?

Two fixed jackstays and a movable search line:

  1. The distance between the fixed jackstays will depend on circumstances, but should not be so long that reliable overlapping of sweeps is prevented. This will depend on the bottom terrain.
  2. Two divers are generally used on this search system. Two heavy jackstays are laid parallel to each other across the bottom of the search area.
  3. A lighter movable jackstay is used to connect the fixed jackstays at one end of the search area. This line is kept reasonably taut, but must not pull the fixed jackstays together.

Single jackstay by lifting it, moving jackstay parallel to the original position and making another sweep.

“J” search - suitable for a solo diver or poor viz. Divers run at a slight angle to its original course. They then sweep back along the line, either searching much of the same ground over again, or simply returning to the start point.

R1. https://en.wikipedia.org/wiki/Underwater_searches

31
Q

20 Three General Rules for Underwater Photos

A

Underwater Photography Specility

“What are the three general rules underwater photographers can follow to achieve good composition and sharper, more colorful images?”

  1. Get Close
  2. Get Low
  3. Shoot UP
32
Q
  1. The Rule of Thirds
A

Cavern, Cave, Technical Diver

“How does the ROTs apply to cavern, cave, Technical, and recreational diving?”

A. Rule of Thirds for Cavern & Cave Divers.
They “call” a dive (turn around” as soon as the 1st team member reaches 2/3 of their starting gas supply. This helps insure that all team members have at least “twice the gas they theoretically need to exit the cavern/cave.
B. Rule of Thirds for Tech Divers.
After determining how much gas is needed for each level of a multilevel tech dive, it is standard practice to pad the amount by at least 50%, thus ensuring an adequate reserve for emergencies.
C. Recreational Divers
Whenever recreational divers venture any distance from their entry/exit point, it is a good idea to follow the ROTs in the same manner as cavern/cave divers.
• 1/3 of supply going out
• 1/3 for return
• 1/3 for contingencies

33
Q
  1. Equipment for Night Dving
A

Night Diver Specialty

“What additional equipment will night divers need that is not generally necessary during daytime dives?”

As a minimum your presentation should include:

  1. Primary, Backup Light, Marker Lights
  2. Exit and/or Range Lights to mark the exit point, boat, or shore.
34
Q
  1. Navigating Around an Object
A

Under Water Navigation Specialty

“How can you use a compass to navigate around an object that is blocking the intended direction of travel.

The most common for doing this is:
1. Upon reaching the obstacle n 90 degrees left or right.
2. While counting kick cycles, follow the new compass heading until clear of the object.
3. Return to the original heading. Continue along this heading until clear of the obstacle.
4. Turn 90 degrees to the left or right to return to the
original line of travel.
5. When you have completed the required number of kick cycles, return to your original heading.

35
Q
  1. Using a Drysuit to Maintain Neutral Byoyancy
A

Drysuit Diver Specialty

“How does controlling buoyancy under water in a drysuit differ from doing so in a wetsuit?”

  1. Proper Weighting -Drysuits generally require more weight.
    a) When properly weighted a drysuit diver may float with only the top of their head touching the surface.
    b) With 35-70 bar/500-700 psi remaining, a properly weighted drysuit diver should be able to hover, neutral, at a safety stop without adding any air to their BC (or dry suit).
  2. Controlling Buoyancy Underwater - drysuit divers strive to keep the gas volume in their dry suits constant, regardless of depth, to help prevent suit squeeze and ensure adequate insulation. In doing so, they should also automatically maintain control over buoyancy.
  3. Drysuit Divers generally use their BCs only to achieve positive buoyancy at the surface and avoid adding air to the BCs underwater.

SCUBA (5 decks)

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