Advanced Scuba Chapter Quizzes (NAUI)

pair navigation equipment with information it provides

Dive computer: duration of swimming and vertical position in the water column compass: bearings and degree markings to plot a path timing device: duration of swimming clear mind: concentration of maintaining a bearing and noting natural navigation aids depth gauge: vertical position in the water column

Gas Management half plus 14/200

Divide cylinder pressur ein half and add 14 bar or 200 psi, this is minimum pressure in scuba sylinder at which you start making your way to exit point

A compass is non-magnetic and does not interact with manmade objects or magnetic fields

False

Natural navigation does not require you to look back at where you have been and should never be combined with compass navigation

False

Pair ODIGTML with what it addresses in your dive plan

L-Logistics: Equipment serviced and ready for use D-Decompression: No decompression limit O-Oxygen: Oxygen toxicity T-Thermal: Suit Thickness I- Inert Gas: Narcosis G- Gas Management: Turn Pressure M-Mission: Goals of the dive

moving the light quickly in horizontal and vertical directions

Need help, distress

Moving the light in an O means

OK

Pair the signal with the correct action

OK: a large O formed by repeating a slow circle attention: slow sweeping movement of light up and down or side to side distress/emergency: rapid movement of the light up and down or side to side surface distress/emergency: light extended moving in exaggerated 180 degree arcs overhead

Rule of thumb to determine how much more weight you will require when ocean diving vs freshwater

Ocean water is 2.5% heavier than fresh water so it provides 2.5% more buoyancy than freshwater

ODIGTML: On Dives I Go Through My Life

Oxygen, Decompression, Inert gas narcosis, Gas management, thermal, Mission, Logistics

RMV Rate

Respiratory minute volume rate: measurement of breathing gas that diver consumes in one minute on surface

match cardinal directions with their correct degree values

South: 180 north: 0 east: 90 west: 270

SAC rate

Surface Air Consumption Rate, given in terms of cylinder presssure and not volume of air

identify the correct ODIGTML category for each item listed

Thermal: neoprene compression at depth gas management: rule of thirds logistics: having additional breathing air available at 15 ft decompression: dive computer/RGBM Inert Gas narcosis: nitrogen narcosis/79% nitrogen mission: exploring a coral reef wall oxygen: 21% oxygen/normal air

Once you have found the minimum amount of weight you need to successfully accomplish your dive you can fine-tune your _____________ by distributing the weight to achieve an ideal position in the water

Trim

Low visibility when diving can be defined as the inability to identify another diver at a distance of 3m (10ft) in a horizontal direction

True

True or False: A SAC rate is dependent on the cylinder used when it was calculated?

True

procedures and precautions for deeper dives

Whenever possible/practicle it is recommended that surface support/personnel divers be present during deeper dives note the direction of any current and be aware that the current at the bottom may run in a different direction than the surface current if there is a difference in the readings on your gauges compared to those on your buddy's gauges use the more conservative reading\ stop at 5m to decompress for a minimum of 3 minutes, even if total dive time is under the no-decompression limits

If diving from an anchored boat, you will usually descend on a line, should you begin your dive into the current?

Yes so you can return to the boat with the current in your favor

safety stop

a 3-5 min stop at 5 msw: strongly recommended for all no stop dives

letter group

a letter symbol for the amount of residual nitrogen remaining in the body from the previous dives

ADT

actual dive time: time from moment of descent until arriving at safety stop

AMDT

adjusted max dive time: the max dive time for the depth of a dive, minus the RNT

in your own diving, you should stay within your comfort envelope by

advancing gradually towards greater depths

repetitive dive

any dive made less than 24 hours after previous dive

BT

bottom time: time from the moment of descent to the beginning of ascent

Types of search patterns

contour expanding square parallel line circular

Summary searching for an object

determine starting point for the search and define the limits of the search area -limits may be done with depth, distance, time or any relevant parameter determine what search pattern would be most effective given the area -factors such as current, visibility, object size and boat traffic determine how to track/mark off the areas that have already been searched -maybe use weighted buoys or compass bearings -if pattern is completed and object not found, determin new starting point with slightly overlapping the original area Mark the position of the object with marked buoy once it's been located

Gas management rule of thirds

divers return after one third of available air is used

it is okay to share depth/timing devices or computers as a buddy team as long as you stay near each other

false

participation in a night dive during this course certifies me as a night diver and I should not seek additional training if I want to gain more experience at night

false

put the basic procedure for compass navigation in the correct order

have a starting heading and follow a general course take a bearing on the most distant object you can see for your heading as you go from point to point mentally note natural navigation items that might aid you on return be aware of deviation if you're navigating around wrecks or other ferrous metal objects As you swim compensate for currents to maintain the bearing

Place summary list in the correct order for the procedures of night diving

keep excursions short monitor instruments and buddy more frequently if separated cover your light and slowly turn in a circle looking for your buddies light keep your light beam out of other divers and animals eyes if your light fails switch to a back up, signal your buddy, and make a controlled ascent control your anxiety

moving the light in a slow arc

look here

MDT

maximum dive time: max dive time allowed without requiring decompression stop

You spent 25 minutes at a depth of 18 msw (60fsw) and consumed 60bar (882psi) of air from an 11 L cylinder (80 cubic feet with working pressure of 3000psi). What is your RMV?

metric RMV 9.5 / Imperial RMV 0.4

equipment for wreck dives

minimum depth gauge, dive computer, compass, underwater slate

Using the ODIGTML dive planning method, night diving would add additional steps to the ____ sections of the dive plan

mission and logistics

what is nitrogen narcosis

occurs at a depth below 18m and produces narcotic effect of nitrogen under pressure which produces impaired thought and judgement.

lights are an obvious requirement for diving at night, but you may not be aware that several different types are available. The principle requirement is a good ____ dive light. A smaller ____ light is also useful to make a safe exit in the event your ____ light fails during the dive. Each diver should have both a ____ and a ____ light

primary, backup, primary, primary, backup

if deeper diving is going to be a regular activity you will need to have some additional equipment to your normal gear, check all that apply

redundant dive computers or depth/timing device redundant scuba/pony bottle extra breathing gas cylinder hanging at the safety stop

RNT

residual nitrogen time: nitrogen remaining in the body from a dive or dives made within the past 24 hours

SIT

surface interval time: the time spent at the surface between dives

TNT

total nitrogen time: the sum of RNT and ADT

Complete backup or redundant scuba system such as a pony bottle with own regulator may be recommended for deeper diving

true

External wreck diving doesn't require any equipment beyond your regular gear

true

The dive planning for deeper diving will increase the importance of every element in the ODIGTML dive plan

true

The most efficient way to approximately measure 800 m underwater is to use kick cycles to count the distance traveled

true

completion of NAUI advanced scuba diver course can prepare you to undertake no-required-decompression dives at depths up to 40m (130ft)

true

compression of wetsuit at depth can cause increased heat loss

true

deeper diving is generally defined as dives to depths greater than 18m (60ft)

true

surface intervals must be at least 10 minutes in length but NAUI recommends that you spend at least an hour on the surface between dives

true

the increased density of gas with pressure/depth increases your rate of breathing gas consumption

true

Put the steps of surface positioning or getting a fix in the correct order

visually identify two objects that are directly inline with each other take a bearing on the first pair of objects write down the objects and the bearing turn 90 and select two more objects that are directly inline with that bearing write down the second pair of objects and their bearing

put the basic natural navigation procedure in the correct order

1) establish starting references 2) follow pre-planned general course 3 )move forward from nav aid to nav aid and frequently look back 4) develop a desire to remember

Using the Gas rule of Half plus 14 bar (200psi) what is the turn pressure for a diver starting out with 238bar (3500psi) in their tank?

133 bar/ 1950 psi

deeper diving is generally defined as dives to depths greater than

18 m (60 ft)